21556286 ÷ 579 
We want to figure out the number of times 21556286 can be divided by 579.

Let's proceed to step 1:
579 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 579

Going ahead to step 2:
21 divided by 579 is 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 579

Going ahead to step 3:
579 goes into 215 0 times with a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 215 leaves us with 215.
Bring next digit (5) of the dividend behind the 215 and repeat the process: 2155 / 579

Moving on to step 4:
When dividing 2155 by 579, we get 3 with a remainder of 418.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 1737 from 2155, we get 418.
Fetch the next digit (6) from the dividend, attach it to 418 and continue: 4186 / 579

Going ahead to step 5:
The number 579 fits into 4186 7 times, leaving a remainder of 133.
Record the quotient 7 as the next digit in the result. 
Result so far: 37.0
Deduct 4053 from 4186 and we're left with 133.
Fetch the next digit (2) from the dividend, attach it to 133 and continue: 1332 / 579

Step 6:
1332 divided by 579 is 2 with a remainder of 174.
Put 2 as the next digit of the answer. 
Result so far: 372.0
The remainder is 174 after subtracting 1158 from 1332.
Bring next digit (8) of the dividend behind the 174 and repeat the process: 1748 / 579

On to step 7:
If we divide 1748 by 579, we get 3 and a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 3723.0
The remainder is 11 after subtracting 1737 from 1748.
Grab the next digit (6) from the dividend, add it to 11, then carry on: 116 / 579

Step 8:
When dividing 116 by 579, we get 0 with a remainder of 116.
The number 0 becomes the next digit in our result. 
Result so far: 37230.0
If we subtract 0 from 116, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

On to step 9:
The number 579 fits into 1160 2 times, leaving a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 37230.2
If we take 1158 away from 1160, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
If we divide 20 by 579, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 37230.2
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
579 can be fit into 200 0 times, resulting in a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 37230.2
If we take 0 away from 200, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

After the division, we end up with 37230.2 and a remainder of 0.02.