We divide 445926 by 21
We want to figure out the number of times 445926 can be divided by 21.

Advancing to step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (4) from the dividend after 4, then repeat: 44 / 21

Let's proceed to step 2:
When dividing 44 by 21, we get 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 42 from 44, we get 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 21

Let's proceed to step 3:
21 can be fit into 25 1 times, resulting in a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
If we subtract 21 from 25, we get 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 21

Step 4:
21 goes into 49 2 times with a remainder of 7.
The next digit of our result is 2. 
Result so far: 212.0
Subtract 42 from 49 to get 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 21

Step 5:
The number 21 fits into 72 3 times, leaving a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 2123.0
The remainder is 9 after subtracting 63 from 72.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 21

Let's proceed to step 6:
21 can be fit into 96 4 times, resulting in a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 21234.0
Subtract 84 from 96 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 7:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 21234.5
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 8:
When dividing 150 by 21, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 21234.57
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 9:
When dividing 30 by 21, we get 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 21234.571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 10:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 21234.5714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
21 goes into 60 2 times with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 21234.57142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 12:
21 goes into 180 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 21234.571428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 13:
21 can be fit into 120 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 21234.5714285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 14:
If we divide 150 by 21, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 21234.57142857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 21234.57142857, with a leftover of 3e-09.