459635 ÷ 21 
We want to divide 459635 by 21.

Going ahead to step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 21

Moving on to step 2:
The number 21 fits into 45 2 times, leaving a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 42 from 45 and we're left with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 21

Going ahead to step 3:
21 can be fit into 39 1 times, resulting in a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 21.0
Subtracting 21 from 39 leaves us with 18.
Grab the next digit (6) from the dividend, add it to 18, then carry on: 186 / 21

Moving on to step 4:
When dividing 186 by 21, we get 8 with a remainder of 18.
The next digit of our result is 8. 
Result so far: 218.0
Subtracting 168 from 186 leaves us with 18.
Bring next digit (3) of the dividend behind the 18 and repeat the process: 183 / 21

Going ahead to step 5:
183 divided by 21 is 8 with a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 2188.0
If we subtract 168 from 183, we get 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 21

Advancing to step 6:
21 goes into 155 7 times with a remainder of 8.
The next digit of our result is 7. 
Result so far: 21887.0
If we subtract 147 from 155, we get 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 7:
21 goes into 80 3 times with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 21887.3
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 8:
If we divide 170 by 21, we get 8 and a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 21887.38
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 9:
21 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 21887.38
Subtract 0 from 20 to 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.

Moving on to step 10:
21 goes into 200 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 21887.3809
Deduct 189 from 200 and we're left 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.

Advancing to step 11:
The number 21 fits into 110 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 21887.38095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 12:
If we divide 50 by 21, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 21887.380952
Subtracting 42 from 50 leaves us 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.

Going ahead to step 13:
When dividing 80 by 21, we get 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 21887.3809523
The remainder is 17 after subtracting 63 from 80.
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 14:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 21887.38095238
Subtracting 168 from 170 leaves us 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.

In conclusion, the division gives 21887.38095238 with a balance of 2e-09.