We're dividing 21605166 by 921 
The aim is to understand the frequency of 921 in 21605166.

Going ahead to step 1:
The number 921 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 921

Advancing to step 2:
21 divided by 921 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 921

Step 3:
921 goes into 216 0 times with a remainder of 216.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 216, we get 216.
Fetch the next digit (0) from the dividend, attach it to 216 and continue: 2160 / 921

Let's proceed to step 4:
921 goes into 2160 2 times with a remainder of 318.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 318 after subtracting 1842 from 2160.
Include the next digit (5) from the dividend after 318, then repeat: 3185 / 921

Step 5:
921 can be fit into 3185 3 times, resulting in a remainder of 422.
The next digit of our result is 3. 
Result so far: 23.0
Subtract 2763 from 3185 to get 422.
Fetch the next digit (1) from the dividend, attach it to 422 and continue: 4221 / 921

Let's proceed to step 6:
921 goes into 4221 4 times with a remainder of 537.
The number 4 becomes the next digit in our result. 
Result so far: 234.0
If we subtract 3684 from 4221, we get 537.
Fetch the next digit (6) from the dividend, attach it to 537 and continue: 5376 / 921

On to step 7:
921 can be fit into 5376 5 times, resulting in a remainder of 771.
Record the quotient 5 as the next digit in the result. 
Result so far: 2345.0
Deduct 4605 from 5376 and we're left with 771.
Grab the next digit (6) from the dividend, add it to 771, then carry on: 7716 / 921

Going ahead to step 8:
If we divide 7716 by 921, we get 8 and a remainder of 348.
Put 8 as the next digit of the answer. 
Result so far: 23458.0
Subtract 7368 from 7716 to get 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

On to step 9:
3480 divided by 921 is 3 with a remainder of 717.
Write down 3 as next digit of the result. 
Result so far: 23458.3
Deduct 2763 from 3480 and we're left with 717.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7170, and continue the process.

Moving on to step 10:
When dividing 7170 by 921, we get 7 with a remainder of 723.
Write down 7 as next digit of the result. 
Result so far: 23458.37
The remainder is 723 after subtracting 6447 from 7170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7230, and continue the process.

Let's proceed to step 11:
921 goes into 7230 7 times with a remainder of 783.
Use 7 as the next digit of our solution. 
Result so far: 23458.377
The remainder is 783 after subtracting 6447 from 7230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7830, and continue the process.

The quotient of the division is 23458.377, and the remainder is 0.0783.