21075285 divided by 799 
We want to figure out the number of times 21075285 can be divided by 799.

On to step 1:
When dividing 2 by 799, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 799

Let's proceed to step 2:
799 goes into 21 0 times with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 799

On to step 3:
210 divided by 799 is 0 with a remainder of 210.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 210 leaves us with 210.
Grab the next digit (7) from the dividend, add it to 210, then carry on: 2107 / 799

Advancing to step 4:
799 can be fit into 2107 2 times, resulting in a remainder of 509.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 1598 from 2107, we get 509.
Fetch the next digit (5) from the dividend, attach it to 509 and continue: 5095 / 799

Let's proceed to step 5:
799 can be fit into 5095 6 times, resulting in a remainder of 301.
The next digit of our result is 6. 
Result so far: 26.0
The remainder is 301 after subtracting 4794 from 5095.
Include the next digit (2) from the dividend after 301, then repeat: 3012 / 799

Advancing to step 6:
799 can be fit into 3012 3 times, resulting in a remainder of 615.
Use 3 as the next digit of our solution. 
Result so far: 263.0
Subtracting 2397 from 3012 leaves us with 615.
Include the next digit (8) from the dividend after 615, then repeat: 6158 / 799

On to step 7:
799 can be fit into 6158 7 times, resulting in a remainder of 565.
Use 7 as the next digit of our solution. 
Result so far: 2637.0
Subtract 5593 from 6158 to get 565.
Grab the next digit (5) from the dividend, add it to 565, then carry on: 5655 / 799

Step 8:
The number 799 fits into 5655 7 times, leaving a remainder of 62.
Put 7 as the next digit of the answer. 
Result so far: 26377.0
Subtracting 5593 from 5655 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 9:
799 goes into 620 0 times with a remainder of 620.
The next digit of our result is 0. 
Result so far: 26377.0
Subtract 0 from 620 to get 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Step 10:
When dividing 6200 by 799, we get 7 with a remainder of 607.
The next digit of our result is 7. 
Result so far: 26377.07
The remainder is 607 after subtracting 5593 from 6200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6070, and continue the process.

Advancing to step 11:
When dividing 6070 by 799, we get 7 with a remainder of 477.
The next digit of our result is 7. 
Result so far: 26377.077
If we take 5593 away from 6070, we end up with 477.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4770, and continue the process.

The quotient of the division is 26377.077, and the remainder is 0.0477.