649721 divided by 21 
We want to figure out the number of times 649721 can be divided by 21.

Going ahead to step 1:
21 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 21

Let's proceed to step 2:
21 can be fit into 64 3 times, resulting in a remainder of 1.
The next digit of our result is 3. 
Result so far: 3.0
If we take 63 away from 64, we end up with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 21

Going ahead to step 3:
21 goes into 19 0 times with a remainder of 19.
The next digit of our result is 0. 
Result so far: 30.0
If we subtract 0 from 19, we get 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 21

Let's proceed to step 4:
When dividing 197 by 21, we get 9 with a remainder of 8.
Put 9 as the next digit of the answer. 
Result so far: 309.0
Deduct 189 from 197 and we're left with 8.
Grab the next digit (2) from the dividend, add it to 8, then carry on: 82 / 21

Moving on to step 5:
If we divide 82 by 21, we get 3 and a remainder of 19.
The number 3 becomes the next digit in our result. 
Result so far: 3093.0
If we subtract 63 from 82, we get 19.
Take the next digit (1) from the dividend and append it to 19, then repeat: 191 / 21

Moving on to step 6:
When dividing 191 by 21, we get 9 with a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 30939.0
If we subtract 189 from 191, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
When dividing 20 by 21, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 30939.0
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 30939.09
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 9:
When dividing 110 by 21, we get 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 30939.095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 10:
If we divide 50 by 21, we get 2 and a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 30939.0952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 11:
If we divide 80 by 21, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 30939.09523
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 12:
21 goes into 170 8 times with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 30939.095238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 13:
21 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 30939.095238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
When dividing 200 by 21, we get 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 30939.09523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Our division results in 30939.09523809 with a remaining 1.1e-08.