21654779 divided by 321 
The aim is to understand the frequency of 321 in 21654779.

On to step 1:
The number 321 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 321

Moving on to step 2:
21 divided by 321 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 321

Advancing to step 3:
When dividing 216 by 321, we get 0 with a remainder of 216.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 216 leaves us with 216.
Take the next digit (5) from the dividend and append it to 216, then repeat: 2165 / 321

On to step 4:
When dividing 2165 by 321, we get 6 with a remainder of 239.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
The remainder is 239 after subtracting 1926 from 2165.
Append the next digit (4) from the dividend to 239 and continue with: 2394 / 321

Moving on to step 5:
If we divide 2394 by 321, we get 7 and a remainder of 147.
Put 7 as the next digit of the answer. 
Result so far: 67.0
Deduct 2247 from 2394 and we're left with 147.
Grab the next digit (7) from the dividend, add it to 147, then carry on: 1477 / 321

Step 6:
1477 divided by 321 is 4 with a remainder of 193.
Record the quotient 4 as the next digit in the result. 
Result so far: 674.0
Subtract 1284 from 1477 to get 193.
Take the next digit (7) from the dividend and append it to 193, then repeat: 1937 / 321

Moving on to step 7:
The number 321 fits into 1937 6 times, leaving a remainder of 11.
Use 6 as the next digit of our solution. 
Result so far: 6746.0
Subtract 1926 from 1937 to get 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 321

Moving on to step 8:
If we divide 119 by 321, we get 0 and a remainder of 119.
The number 0 becomes the next digit in our result. 
Result so far: 67460.0
If we subtract 0 from 119, we get 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Step 9:
When dividing 1190 by 321, we get 3 with a remainder of 227.
The next digit of our result is 3. 
Result so far: 67460.3
If we subtract 963 from 1190, we get 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

Step 10:
321 can be fit into 2270 7 times, resulting in a remainder of 23.
The next digit of our result is 7. 
Result so far: 67460.37
Subtract 2247 from 2270 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 11:
321 can be fit into 230 0 times, resulting in a remainder of 230.
Write down 0 as next digit of the result. 
Result so far: 67460.37
The remainder is 230 after subtracting 0 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Step 12:
321 can be fit into 2300 7 times, resulting in a remainder of 53.
Put 7 as the next digit of the answer. 
Result so far: 67460.3707
If we subtract 2247 from 2300, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 13:
If we divide 530 by 321, we get 1 and a remainder of 209.
The number 1 becomes the next digit in our result. 
Result so far: 67460.37071
Subtract 321 from 530 to get 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Moving on to step 14:
2090 divided by 321 is 6 with a remainder of 164.
Write down 6 as next digit of the result. 
Result so far: 67460.370716
The remainder is 164 after subtracting 1926 from 2090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Let's proceed to step 15:
1640 divided by 321 is 5 with a remainder of 35.
The next digit of our result is 5. 
Result so far: 67460.3707165
If we take 1605 away from 1640, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 16:
350 divided by 321 is 1 with a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 67460.37071651
Deduct 321 from 350 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Our division results in 67460.37071651 with a remaining 2.9e-08.