We're dividing 455826 by 21 
Let's see how many times 21 fits into 455826.

Let's proceed to step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 21

On to step 2:
21 can be fit into 45 2 times, resulting in 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.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 21

Moving on to step 3:
21 goes into 35 1 times with a remainder of 14.
Use 1 as the next digit of our solution. 
Result so far: 21.0
Deduct 21 from 35 and we're left with 14.
Grab the next digit (8) from the dividend, add it to 14, then carry on: 148 / 21

On to step 4:
The number 21 fits into 148 7 times, leaving a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 217.0
If we subtract 147 from 148, we get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 21

On to step 5:
When dividing 12 by 21, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 2170.0
The remainder is 12 after subtracting 0 from 12.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 21

Advancing to step 6:
If we divide 126 by 21, we get 6 and a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 21706.0
If we take 126 away from 126, 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.

Advancing to step 7:
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: 21706.0
If we subtract 0 from 0, we 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.

Step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 21706.0
Subtracting 0 from 0 leaves us 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.

In conclusion, the division gives 21706.0 with a balance of 0.0.