We look at the division of 21621200 by 791 
We're looking to find how many times 791 goes into 21621200.

Step 1:
If we divide 2 by 791, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 791

Let's proceed to step 2:
If we divide 21 by 791, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 791

Advancing to step 3:
The number 791 fits into 216 0 times, leaving a remainder of 216.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 216 leaves us with 216.
Include the next digit (2) from the dividend after 216, then repeat: 2162 / 791

Going ahead to step 4:
791 can be fit into 2162 2 times, resulting in a remainder of 580.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 1582 from 2162, we get 580.
Take the next digit (1) from the dividend and append it to 580, then repeat: 5801 / 791

Step 5:
791 goes into 5801 7 times with a remainder of 264.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
The remainder is 264 after subtracting 5537 from 5801.
Bring next digit (2) of the dividend behind the 264 and repeat the process: 2642 / 791

Moving on to step 6:
791 can be fit into 2642 3 times, resulting in a remainder of 269.
The next digit of our result is 3. 
Result so far: 273.0
If we take 2373 away from 2642, we end up with 269.
Grab the next digit (0) from the dividend, add it to 269, then carry on: 2690 / 791

Step 7:
When dividing 2690 by 791, we get 3 with a remainder of 317.
Put 3 as the next digit of the answer. 
Result so far: 2733.0
Subtract 2373 from 2690 to get 317.
Grab the next digit (0) from the dividend, add it to 317, then carry on: 3170 / 791

Advancing to step 8:
When dividing 3170 by 791, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 27334.0
Deduct 3164 from 3170 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 9:
The number 791 fits into 60 0 times, leaving a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 27334.0
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 10:
791 goes into 600 0 times with a remainder of 600.
The next digit of our result is 0. 
Result so far: 27334.0
If we take 0 away from 600, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

The final result is 27334.0 with a remainder of 0.6.