We're dividing 92250921 by 21 
We want to divide 92250921 by 21.

Going ahead to step 1:
21 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 21

Going ahead to step 2:
When dividing 92 by 21, we get 4 with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Deduct 84 from 92 and we're left with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 21

On to step 3:
82 divided by 21 is 3 with a remainder of 19.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we take 63 away from 82, we end up with 19.
Take the next digit (5) from the dividend and append it to 19, then repeat: 195 / 21

Step 4:
21 can be fit into 195 9 times, resulting in a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 439.0
Deduct 189 from 195 and we're left with 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 21

On to step 5:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 4392.0
If we take 42 away from 60, we end up with 18.
Append the next digit (9) from the dividend to 18 and continue with: 189 / 21

Going ahead to step 6:
If we divide 189 by 21, we get 9 and a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 43929.0
Subtract 189 from 189 to get 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 21

Advancing to step 7:
The number 21 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 439290.0
Subtract 0 from 2 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 21

On to step 8:
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: 4392901.0
If we take 21 away from 21, 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.

Advancing to step 9:
21 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 4392901.0
Subtract 0 from 0 to 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.

Going ahead to step 10:
0 divided by 21 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 4392901.0
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.

After the division, we end up with 4392901.0 and a remainder of 0.0.