We divide 25105320 by 221
The aim is to understand the frequency of 221 in 25105320.

Moving on to step 1:
2 divided by 221 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 221

Moving on to step 2:
25 divided by 221 is 0 with a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Include the next digit (1) from the dividend after 25, then repeat: 251 / 221

Moving on to step 3:
221 can be fit into 251 1 times, resulting in a remainder of 30.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 221 from 251 to get 30.
Fetch the next digit (0) from the dividend, attach it to 30 and continue: 300 / 221

Let's proceed to step 4:
The number 221 fits into 300 1 times, leaving a remainder of 79.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Deduct 221 from 300 and we're left with 79.
Include the next digit (5) from the dividend after 79, then repeat: 795 / 221

Moving on to step 5:
221 can be fit into 795 3 times, resulting in a remainder of 132.
The number 3 becomes the next digit in our result. 
Result so far: 113.0
The remainder is 132 after subtracting 663 from 795.
Fetch the next digit (3) from the dividend, attach it to 132 and continue: 1323 / 221

On to step 6:
The number 221 fits into 1323 5 times, leaving a remainder of 218.
The number 5 becomes the next digit in our result. 
Result so far: 1135.0
Subtract 1105 from 1323 to get 218.
Grab the next digit (2) from the dividend, add it to 218, then carry on: 2182 / 221

Moving on to step 7:
221 goes into 2182 9 times with a remainder of 193.
The next digit of our result is 9. 
Result so far: 11359.0
Subtract 1989 from 2182 to get 193.
Fetch the next digit (0) from the dividend, attach it to 193 and continue: 1930 / 221

Moving on to step 8:
221 can be fit into 1930 8 times, resulting in a remainder of 162.
The next digit of our result is 8. 
Result so far: 113598.0
Subtracting 1768 from 1930 leaves us with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

On to step 9:
The number 221 fits into 1620 7 times, leaving a remainder of 73.
Use 7 as the next digit of our solution. 
Result so far: 113598.7
The remainder is 73 after subtracting 1547 from 1620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 10:
730 divided by 221 is 3 with a remainder of 67.
The next digit of our result is 3. 
Result so far: 113598.73
Subtracting 663 from 730 leaves us with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Moving on to step 11:
221 goes into 670 3 times with a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 113598.733
If we subtract 663 from 670, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

In conclusion, the division gives 113598.733 with a balance of 0.0007.