We look at the division of 23563266 by 421 
The aim is to understand the frequency of 421 in 23563266.

Let's proceed to step 1:
421 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 421

Step 2:
421 goes into 23 0 times with a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 23, we get 23.
Append the next digit (5) from the dividend to 23 and continue with: 235 / 421

Going ahead to step 3:
421 goes into 235 0 times with a remainder of 235.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 235, we end up with 235.
Include the next digit (6) from the dividend after 235, then repeat: 2356 / 421

Step 4:
2356 divided by 421 is 5 with a remainder of 251.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 251 after subtracting 2105 from 2356.
Append the next digit (3) from the dividend to 251 and continue with: 2513 / 421

Let's proceed to step 5:
If we divide 2513 by 421, we get 5 and a remainder of 408.
Write down 5 as next digit of the result. 
Result so far: 55.0
The remainder is 408 after subtracting 2105 from 2513.
Append the next digit (2) from the dividend to 408 and continue with: 4082 / 421

Going ahead to step 6:
421 can be fit into 4082 9 times, resulting in a remainder of 293.
Record the quotient 9 as the next digit in the result. 
Result so far: 559.0
If we take 3789 away from 4082, we end up with 293.
Append the next digit (6) from the dividend to 293 and continue with: 2936 / 421

Step 7:
If we divide 2936 by 421, we get 6 and a remainder of 410.
Write down 6 as next digit of the result. 
Result so far: 5596.0
If we subtract 2526 from 2936, we get 410.
Include the next digit (6) from the dividend after 410, then repeat: 4106 / 421

On to step 8:
If we divide 4106 by 421, we get 9 and a remainder of 317.
Write down 9 as next digit of the result. 
Result so far: 55969.0
If we take 3789 away from 4106, we end up with 317.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Step 9:
3170 divided by 421 is 7 with a remainder of 223.
Write down 7 as next digit of the result. 
Result so far: 55969.7
Deduct 2947 from 3170 and we're left with 223.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2230, and continue the process.

Step 10:
The number 421 fits into 2230 5 times, leaving a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 55969.75
Deduct 2105 from 2230 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Going ahead to step 11:
1250 divided by 421 is 2 with a remainder of 408.
Record the quotient 2 as the next digit in the result. 
Result so far: 55969.752
If we take 842 away from 1250, we end up with 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

On to step 12:
The number 421 fits into 4080 9 times, leaving a remainder of 291.
Record the quotient 9 as the next digit in the result. 
Result so far: 55969.7529
Subtracting 3789 from 4080 leaves us with 291.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2910, and continue the process.

Going ahead to step 13:
2910 divided by 421 is 6 with a remainder of 384.
Record the quotient 6 as the next digit in the result. 
Result so far: 55969.75296
Subtracting 2526 from 2910 leaves us with 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Moving on to step 14:
421 goes into 3840 9 times with a remainder of 51.
Record the quotient 9 as the next digit in the result. 
Result so far: 55969.752969
Subtracting 3789 from 3840 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 15:
510 divided by 421 is 1 with a remainder of 89.
Record the quotient 1 as the next digit in the result. 
Result so far: 55969.7529691
Subtract 421 from 510 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 16:
If we divide 890 by 421, we get 2 and a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 55969.75296912
Subtracting 842 from 890 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

After the division, we end up with 55969.75296912 and a remainder of 4.8e-08.