613641 ÷ 21 
Let's see how many times 21 fits into 613641.

Going ahead to step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 21

Going ahead to step 2:
61 divided by 21 is 2 with a remainder of 19.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 19 after subtracting 42 from 61.
Bring next digit (3) of the dividend behind the 19 and repeat the process: 193 / 21

Going ahead to step 3:
When dividing 193 by 21, we get 9 with a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
Subtracting 189 from 193 leaves us with 4.
Bring next digit (6) of the dividend behind the 4 and repeat the process: 46 / 21

Let's proceed to step 4:
When dividing 46 by 21, we get 2 with a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 292.0
Subtracting 42 from 46 leaves us with 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 21

Let's proceed to step 5:
44 divided by 21 is 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 2922.0
If we subtract 42 from 44, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 21

Going ahead to step 6:
If we divide 21 by 21, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 29221.0
The remainder is 0 after subtracting 21 from 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
If we divide 0 by 21, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 29221.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
If we divide 0 by 21, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 29221.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 29221.0, with a leftover of 0.0.