We're dividing 21850087 by 42 
We want to divide 21850087 by 42.

Step 1:
42 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 42

Moving on to step 2:
When dividing 21 by 42, we get 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Bring next digit (8) of the dividend behind the 21 and repeat the process: 218 / 42

On to step 3:
42 goes into 218 5 times with a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 210 away from 218, we end up with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 42

On to step 4:
If we divide 85 by 42, we get 2 and a remainder of 1.
The next digit of our result is 2. 
Result so far: 52.0
Subtracting 84 from 85 leaves us with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 42

Advancing to step 5:
10 divided by 42 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 520.0
Deduct 0 from 10 and we're left with 10.
Take the next digit (0) from the dividend and append it to 10, then repeat: 100 / 42

Going ahead to step 6:
When dividing 100 by 42, we get 2 with a remainder of 16.
Use 2 as the next digit of our solution. 
Result so far: 5202.0
Subtract 84 from 100 to get 16.
Include the next digit (8) from the dividend after 16, then repeat: 168 / 42

Let's proceed to step 7:
42 goes into 168 4 times with a remainder of 0.
The next digit of our result is 4. 
Result so far: 52024.0
Subtracting 168 from 168 leaves us with 0.
Append the next digit (7) from the dividend to 0 and continue with: 7 / 42

Going ahead to step 8:
When dividing 7 by 42, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 520240.0
Deduct 0 from 7 and we're left 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.

Moving on to step 9:
42 can be fit into 70 1 times, resulting in a remainder of 28.
Put 1 as the next digit of the answer. 
Result so far: 520240.1
The remainder is 28 after subtracting 42 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 10:
The number 42 fits into 280 6 times, leaving a remainder of 28.
Use 6 as the next digit of our solution. 
Result so far: 520240.16
The remainder is 28 after subtracting 252 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 11:
When dividing 280 by 42, we get 6 with a remainder of 28.
The next digit of our result is 6. 
Result so far: 520240.166
Subtracting 252 from 280 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The quotient of the division is 520240.166, and the remainder is 0.0028.