We look at the division of 500976 by 21 
We want to figure out the number of times 500976 can be divided by 21.

Step 1:
21 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 21

Step 2:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 42 from 50 to get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 21

Advancing to step 3:
When dividing 80 by 21, we get 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
If we take 63 away from 80, we end up with 17.
Append the next digit (9) from the dividend to 17 and continue with: 179 / 21

Let's proceed to step 4:
179 divided by 21 is 8 with a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 238.0
The remainder is 11 after subtracting 168 from 179.
Append the next digit (7) from the dividend to 11 and continue with: 117 / 21

Step 5:
When dividing 117 by 21, we get 5 with a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 2385.0
If we subtract 105 from 117, we get 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.
Record the quotient 6 as the next digit in the result. 
Result so far: 23856.0
Subtracting 126 from 126 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.

Going ahead to step 7:
21 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 23856.0
Subtract 0 from 0 to 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.

Going ahead to step 8:
When dividing 0 by 21, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 23856.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 23856.0, with a leftover of 0.0.