Let's divide 21105547 by 81
We want to figure out the number of times 21105547 can be divided by 81.

On to step 1:
When dividing 2 by 81, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 81

Step 2:
When dividing 21 by 81, we get 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (1) from the dividend to 21 and continue with: 211 / 81

Let's proceed to step 3:
211 divided by 81 is 2 with a remainder of 49.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 162 from 211 to get 49.
Append the next digit (0) from the dividend to 49 and continue with: 490 / 81

Going ahead to step 4:
When dividing 490 by 81, we get 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
The remainder is 4 after subtracting 486 from 490.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 81

Let's proceed to step 5:
81 goes into 45 0 times with a remainder of 45.
Use 0 as the next digit of our solution. 
Result so far: 260.0
Deduct 0 from 45 and we're left with 45.
Append the next digit (5) from the dividend to 45 and continue with: 455 / 81

Step 6:
When dividing 455 by 81, we get 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 2605.0
If we take 405 away from 455, we end up with 50.
Include the next digit (4) from the dividend after 50, then repeat: 504 / 81

Moving on to step 7:
81 goes into 504 6 times with a remainder of 18.
The number 6 becomes the next digit in our result. 
Result so far: 26056.0
The remainder is 18 after subtracting 486 from 504.
Append the next digit (7) from the dividend to 18 and continue with: 187 / 81

Moving on to step 8:
When dividing 187 by 81, we get 2 with a remainder of 25.
The number 2 becomes the next digit in our result. 
Result so far: 260562.0
Subtract 162 from 187 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 9:
81 can be fit into 250 3 times, resulting in a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 260562.3
If we take 243 away from 250, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 10:
If we divide 70 by 81, we get 0 and a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 260562.3
If we subtract 0 from 70, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 11:
When dividing 700 by 81, we get 8 with a remainder of 52.
Write down 8 as next digit of the result. 
Result so far: 260562.308
Subtracting 648 from 700 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 12:
The number 81 fits into 520 6 times, leaving a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 260562.3086
The remainder is 34 after subtracting 486 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 13:
81 can be fit into 340 4 times, resulting in a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 260562.30864
If we subtract 324 from 340, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 14:
81 can be fit into 160 1 times, resulting in a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 260562.308641
Subtracting 81 from 160 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 15:
When dividing 790 by 81, we get 9 with a remainder of 61.
The number 9 becomes the next digit in our result. 
Result so far: 260562.3086419
Subtracting 729 from 790 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 16:
When dividing 610 by 81, we get 7 with a remainder of 43.
Write down 7 as next digit of the result. 
Result so far: 260562.30864197
The remainder is 43 after subtracting 567 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

After the division, we end up with 260562.30864197 and a remainder of 4.3e-08.