We look at the division of 772317 by 21 
Let's see how many times 21 fits into 772317.

Advancing to step 1:
When dividing 7 by 21, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 21

Going ahead to step 2:
The number 21 fits into 77 3 times, leaving a remainder of 14.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 63 from 77, we get 14.
Bring next digit (2) of the dividend behind the 14 and repeat the process: 142 / 21

Let's proceed to step 3:
When dividing 142 by 21, we get 6 with a remainder of 16.
The next digit of our result is 6. 
Result so far: 36.0
If we subtract 126 from 142, we get 16.
Fetch the next digit (3) from the dividend, attach it to 16 and continue: 163 / 21

Advancing to step 4:
When dividing 163 by 21, we get 7 with a remainder of 16.
Use 7 as the next digit of our solution. 
Result so far: 367.0
If we subtract 147 from 163, we get 16.
Grab the next digit (1) from the dividend, add it to 16, then carry on: 161 / 21

Advancing to step 5:
21 goes into 161 7 times with a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 3677.0
Subtract 147 from 161 to get 14.
Append the next digit (7) from the dividend to 14 and continue with: 147 / 21

Let's proceed to step 6:
21 can be fit into 147 7 times, resulting in a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 36777.0
If we take 147 away from 147, we end up 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:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 36777.0
If we take 0 away from 0, we end up 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.

Step 8:
21 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 36777.0
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 36777.0 with a remaining 0.0.