21720088 divided by 4 
We want to figure out the number of times 21720088 can be divided by 4.

Let's proceed to step 1:
The number 4 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 4

Going ahead to step 2:
If we divide 21 by 4, we get 5 and a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 20 from 21 leaves us with 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 4

Moving on to step 3:
The number 4 fits into 17 4 times, leaving a remainder of 1.
The next digit of our result is 4. 
Result so far: 54.0
If we subtract 16 from 17, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 4

Step 4:
12 divided by 4 is 3 with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 543.0
Subtracting 12 from 12 leaves us with 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 4

Advancing to step 5:
4 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 5430.0
The remainder is 0 after subtracting 0 from 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 4

Let's proceed to step 6:
4 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 54300.0
Subtract 0 from 0 to get 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 4

Moving on to step 7:
If we divide 8 by 4, we get 2 and a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 543002.0
The remainder is 0 after subtracting 8 from 8.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 4

Moving on to step 8:
If we divide 8 by 4, we get 2 and a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 5430022.0
The remainder is 0 after subtracting 8 from 8.
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 9:
The number 4 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 5430022.0
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.

Advancing to step 10:
When dividing 0 by 4, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5430022.0
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.

Our division results in 5430022.0 with a remaining 0.0.