We divide 408681 by 21
Let's see how many times 21 fits into 408681.

Let's proceed to step 1:
If we divide 4 by 21, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 21

Going ahead to step 2:
40 divided by 21 is 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 21 from 40 leaves us with 19.
Append the next digit (8) from the dividend to 19 and continue with: 198 / 21

Step 3:
When dividing 198 by 21, we get 9 with a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
If we take 189 away from 198, we end up with 9.
Append the next digit (6) from the dividend to 9 and continue with: 96 / 21

On to step 4:
If we divide 96 by 21, we get 4 and a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 194.0
The remainder is 12 after subtracting 84 from 96.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 21

Going ahead to step 5:
21 can be fit into 128 6 times, resulting in a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 1946.0
If we take 126 away from 128, we end up with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 21

Moving on to step 6:
21 can be fit into 21 1 times, resulting in a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 19461.0
Deduct 21 from 21 and we're left 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 7:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 19461.0
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.

Going ahead to step 8:
21 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 19461.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 19461.0 and a remainder of 0.0.