We look at the division of 459859 by 21 
We want to figure out the number of times 459859 can be divided by 21.

Moving on to step 1:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 21

Moving on to step 2:
21 goes into 45 2 times with a remainder of 3.
The number 2 becomes the next digit in our 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:
39 divided by 21 is 1 with a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
If we take 21 away from 39, we end up with 18.
Grab the next digit (8) from the dividend, add it to 18, then carry on: 188 / 21

Step 4:
188 divided by 21 is 8 with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 218.0
Subtracting 168 from 188 leaves us with 20.
Include the next digit (5) from the dividend after 20, then repeat: 205 / 21

Moving on to step 5:
21 can be fit into 205 9 times, resulting in a remainder of 16.
The next digit of our result is 9. 
Result so far: 2189.0
Subtracting 189 from 205 leaves us with 16.
Append the next digit (9) from the dividend to 16 and continue with: 169 / 21

Advancing to step 6:
When dividing 169 by 21, we get 8 with a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 21898.0
Subtracting 168 from 169 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 21898.0
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 21898.04
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 9:
When dividing 160 by 21, we get 7 with a remainder of 13.
The next digit of our result is 7. 
Result so far: 21898.047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 10:
When dividing 130 by 21, we get 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 21898.0476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 11:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 21898.04761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 12:
190 divided by 21 is 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 21898.047619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 13:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 21898.047619
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 14:
21 goes into 100 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 21898.04761904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The quotient of the division is 21898.04761904, and the remainder is 1.6e-08.