556128 ÷ 21 
We're looking to find how many times 21 goes into 556128.

Advancing to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 21

Advancing to step 2:
55 divided by 21 is 2 with a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 13 after subtracting 42 from 55.
Fetch the next digit (6) from the dividend, attach it to 13 and continue: 136 / 21

Moving on to step 3:
The number 21 fits into 136 6 times, leaving a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
Subtract 126 from 136 to get 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 21

Advancing to step 4:
If we divide 101 by 21, we get 4 and a remainder of 17.
Use 4 as the next digit of our solution. 
Result so far: 264.0
Subtracting 84 from 101 leaves us with 17.
Take the next digit (2) from the dividend and append it to 17, then repeat: 172 / 21

Let's proceed to step 5:
The number 21 fits into 172 8 times, leaving a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 2648.0
Deduct 168 from 172 and we're left with 4.
Append the next digit (8) from the dividend to 4 and continue with: 48 / 21

Let's proceed to step 6:
The number 21 fits into 48 2 times, leaving a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 26482.0
Subtract 42 from 48 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
When dividing 60 by 21, we get 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 26482.2
If we take 42 away from 60, we end up 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.

On to step 8:
21 goes into 180 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 26482.28
If we take 168 away from 180, we end up 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.

Step 9:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 26482.285
The remainder is 15 after subtracting 105 from 120.
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 10:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 26482.2857
Subtract 147 from 150 to 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.

Going ahead to step 11:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 26482.28571
If we take 21 away from 30, we end up with 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 12:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 26482.285714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 13:
60 divided by 21 is 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 26482.2857142
Deduct 42 from 60 and we're left 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.

Step 14:
When dividing 180 by 21, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 26482.28571428
Deduct 168 from 180 and we're left 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.

The final result is 26482.28571428 with a remainder of 1.2e-08.