We're dividing 65423616 by 21 
We want to figure out the number of times 65423616 can be divided by 21.

On to step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 21

On to step 2:
21 goes into 65 3 times with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 2 after subtracting 63 from 65.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 21

Advancing to step 3:
When dividing 24 by 21, we get 1 with a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 31.0
If we subtract 21 from 24, we get 3.
Fetch the next digit (2) from the dividend, attach it to 3 and continue: 32 / 21

Step 4:
The number 21 fits into 32 1 times, leaving a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 311.0
The remainder is 11 after subtracting 21 from 32.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 21

On to step 5:
If we divide 113 by 21, we get 5 and a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 3115.0
Subtract 105 from 113 to get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 21

On to step 6:
If we divide 86 by 21, we get 4 and a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 31154.0
If we take 84 away from 86, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 21

Advancing to step 7:
When dividing 21 by 21, we get 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 311541.0
Deduct 21 from 21 and we're left with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 21

Advancing to step 8:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 3115410.0
Subtracting 0 from 6 leaves us 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.

Going ahead to step 9:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 3115410.2
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.

Moving on to step 10:
If we divide 180 by 21, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 3115410.28
The remainder is 12 after subtracting 168 from 180.
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 11:
21 goes into 120 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 3115410.285
If we take 105 away from 120, we end up 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.

Let's proceed to step 12:
150 divided by 21 is 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 3115410.2857
Subtracting 147 from 150 leaves us with 3.
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 13:
30 divided by 21 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 3115410.28571
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.

Step 14:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 3115410.285714
The remainder is 6 after subtracting 84 from 90.
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 15:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 3115410.2857142
The remainder is 18 after subtracting 42 from 60.
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 16:
If we divide 180 by 21, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 3115410.28571428
Subtract 168 from 180 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.

The quotient of the division is 3115410.28571428, and the remainder is 1.2e-08.