We divide 21065276 by 321
The aim is to understand the frequency of 321 in 21065276.

Moving on to step 1:
321 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 321

Advancing to step 2:
When dividing 21 by 321, we get 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Take the next digit (0) from the dividend and append it to 21, then repeat: 210 / 321

Advancing to step 3:
321 can be fit into 210 0 times, resulting in a remainder of 210.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 210, we end up with 210.
Bring next digit (6) of the dividend behind the 210 and repeat the process: 2106 / 321

On to step 4:
When dividing 2106 by 321, we get 6 with a remainder of 180.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtracting 1926 from 2106 leaves us with 180.
Take the next digit (5) from the dividend and append it to 180, then repeat: 1805 / 321

Step 5:
When dividing 1805 by 321, we get 5 with a remainder of 200.
Use 5 as the next digit of our solution. 
Result so far: 65.0
The remainder is 200 after subtracting 1605 from 1805.
Append the next digit (2) from the dividend to 200 and continue with: 2002 / 321

Moving on to step 6:
321 can be fit into 2002 6 times, resulting in a remainder of 76.
The number 6 becomes the next digit in our result. 
Result so far: 656.0
If we subtract 1926 from 2002, we get 76.
Grab the next digit (7) from the dividend, add it to 76, then carry on: 767 / 321

Let's proceed to step 7:
When dividing 767 by 321, we get 2 with a remainder of 125.
The number 2 becomes the next digit in our result. 
Result so far: 6562.0
If we subtract 642 from 767, we get 125.
Include the next digit (6) from the dividend after 125, then repeat: 1256 / 321

Let's proceed to step 8:
321 can be fit into 1256 3 times, resulting in a remainder of 293.
Write down 3 as next digit of the result. 
Result so far: 65623.0
If we subtract 963 from 1256, we get 293.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

Step 9:
321 goes into 2930 9 times with a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 65623.9
Subtracting 2889 from 2930 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Going ahead to step 10:
321 can be fit into 410 1 times, resulting in a remainder of 89.
The number 1 becomes the next digit in our result. 
Result so far: 65623.91
Subtract 321 from 410 to get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 11:
321 can be fit into 890 2 times, resulting in a remainder of 248.
Put 2 as the next digit of the answer. 
Result so far: 65623.912
If we subtract 642 from 890, we get 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

On to step 12:
If we divide 2480 by 321, we get 7 and a remainder of 233.
The next digit of our result is 7. 
Result so far: 65623.9127
If we subtract 2247 from 2480, we get 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Step 13:
321 goes into 2330 7 times with a remainder of 83.
The number 7 becomes the next digit in our result. 
Result so far: 65623.91277
Subtracting 2247 from 2330 leaves us with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

After the division, we end up with 65623.91277 and a remainder of 8.3e-05.