21864141 ÷ 811 
We're looking to find how many times 811 goes into 21864141.

Let's proceed to step 1:
If we divide 2 by 811, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 811

Moving on to step 2:
811 can be fit into 21 0 times, resulting in a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Take the next digit (8) from the dividend and append it to 21, then repeat: 218 / 811

On to step 3:
If we divide 218 by 811, we get 0 and a remainder of 218.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 218, we end up with 218.
Include the next digit (6) from the dividend after 218, then repeat: 2186 / 811

Let's proceed to step 4:
2186 divided by 811 is 2 with a remainder of 564.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 1622 away from 2186, we end up with 564.
Fetch the next digit (4) from the dividend, attach it to 564 and continue: 5644 / 811

Moving on to step 5:
The number 811 fits into 5644 6 times, leaving a remainder of 778.
The next digit of our result is 6. 
Result so far: 26.0
Subtract 4866 from 5644 to get 778.
Grab the next digit (1) from the dividend, add it to 778, then carry on: 7781 / 811

Let's proceed to step 6:
811 goes into 7781 9 times with a remainder of 482.
The next digit of our result is 9. 
Result so far: 269.0
Subtract 7299 from 7781 to get 482.
Append the next digit (4) from the dividend to 482 and continue with: 4824 / 811

Step 7:
4824 divided by 811 is 5 with a remainder of 769.
Write down 5 as next digit of the result. 
Result so far: 2695.0
Deduct 4055 from 4824 and we're left with 769.
Take the next digit (1) from the dividend and append it to 769, then repeat: 7691 / 811

Moving on to step 8:
If we divide 7691 by 811, we get 9 and a remainder of 392.
Put 9 as the next digit of the answer. 
Result so far: 26959.0
If we take 7299 away from 7691, we end up with 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Going ahead to step 9:
The number 811 fits into 3920 4 times, leaving a remainder of 676.
Put 4 as the next digit of the answer. 
Result so far: 26959.4
The remainder is 676 after subtracting 3244 from 3920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6760, and continue the process.

Step 10:
The number 811 fits into 6760 8 times, leaving a remainder of 272.
Use 8 as the next digit of our solution. 
Result so far: 26959.48
If we subtract 6488 from 6760, we get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Moving on to step 11:
811 goes into 2720 3 times with a remainder of 287.
Write down 3 as next digit of the result. 
Result so far: 26959.483
Subtract 2433 from 2720 to get 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Step 12:
811 goes into 2870 3 times with a remainder of 437.
Use 3 as the next digit of our solution. 
Result so far: 26959.4833
Deduct 2433 from 2870 and we're left with 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

The final outcome is 26959.4833, with a leftover of 0.00437.