We look at the division of 21254476 by 601 
The aim is to understand the frequency of 601 in 21254476.

On to step 1:
601 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 601

On to step 2:
21 divided by 601 is 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 601

Moving on to step 3:
When dividing 212 by 601, we get 0 with a remainder of 212.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 212 leaves us with 212.
Grab the next digit (5) from the dividend, add it to 212, then carry on: 2125 / 601

Step 4:
When dividing 2125 by 601, we get 3 with a remainder of 322.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 322 after subtracting 1803 from 2125.
Grab the next digit (4) from the dividend, add it to 322, then carry on: 3224 / 601

Moving on to step 5:
3224 divided by 601 is 5 with a remainder of 219.
The next digit of our result is 5. 
Result so far: 35.0
Subtract 3005 from 3224 to get 219.
Append the next digit (4) from the dividend to 219 and continue with: 2194 / 601

Advancing to step 6:
2194 divided by 601 is 3 with a remainder of 391.
Write down 3 as next digit of the result. 
Result so far: 353.0
The remainder is 391 after subtracting 1803 from 2194.
Take the next digit (7) from the dividend and append it to 391, then repeat: 3917 / 601

On to step 7:
When dividing 3917 by 601, we get 6 with a remainder of 311.
Use 6 as the next digit of our solution. 
Result so far: 3536.0
If we subtract 3606 from 3917, we get 311.
Bring next digit (6) of the dividend behind the 311 and repeat the process: 3116 / 601

Going ahead to step 8:
The number 601 fits into 3116 5 times, leaving a remainder of 111.
Put 5 as the next digit of the answer. 
Result so far: 35365.0
If we subtract 3005 from 3116, we get 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Step 9:
1110 divided by 601 is 1 with a remainder of 509.
The number 1 becomes the next digit in our result. 
Result so far: 35365.1
Subtracting 601 from 1110 leaves us with 509.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5090, and continue the process.

Step 10:
If we divide 5090 by 601, we get 8 and a remainder of 282.
The number 8 becomes the next digit in our result. 
Result so far: 35365.18
Subtract 4808 from 5090 to get 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Advancing to step 11:
If we divide 2820 by 601, we get 4 and a remainder of 416.
Write down 4 as next digit of the result. 
Result so far: 35365.184
Subtracting 2404 from 2820 leaves us with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Moving on to step 12:
If we divide 4160 by 601, we get 6 and a remainder of 554.
The next digit of our result is 6. 
Result so far: 35365.1846
Subtract 3606 from 4160 to get 554.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

Let's proceed to step 13:
If we divide 5540 by 601, we get 9 and a remainder of 131.
Record the quotient 9 as the next digit in the result. 
Result so far: 35365.18469
If we take 5409 away from 5540, we end up with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Going ahead to step 14:
If we divide 1310 by 601, we get 2 and a remainder of 108.
The number 2 becomes the next digit in our result. 
Result so far: 35365.184692
Subtract 1202 from 1310 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 15:
601 can be fit into 1080 1 times, resulting in a remainder of 479.
The next digit of our result is 1. 
Result so far: 35365.1846921
The remainder is 479 after subtracting 601 from 1080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4790, and continue the process.

Let's proceed to step 16:
If we divide 4790 by 601, we get 7 and a remainder of 583.
Record the quotient 7 as the next digit in the result. 
Result so far: 35365.18469217
Subtract 4207 from 4790 to get 583.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5830, and continue the process.

After the division, we end up with 35365.18469217 and a remainder of 5.83e-07.