We divide 15371637 by 221
The aim is to understand the frequency of 221 in 15371637.

Let's proceed to step 1:
If we divide 1 by 221, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 221

Advancing to step 2:
221 can be fit into 15 0 times, resulting in a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Fetch the next digit (3) from the dividend, attach it to 15 and continue: 153 / 221

Going ahead to step 3:
153 divided by 221 is 0 with a remainder of 153.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 153 and we're left with 153.
Take the next digit (7) from the dividend and append it to 153, then repeat: 1537 / 221

Moving on to step 4:
If we divide 1537 by 221, we get 6 and a remainder of 211.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 1326 from 1537 to get 211.
Bring next digit (1) of the dividend behind the 211 and repeat the process: 2111 / 221

Let's proceed to step 5:
221 can be fit into 2111 9 times, resulting in a remainder of 122.
The next digit of our result is 9. 
Result so far: 69.0
If we take 1989 away from 2111, we end up with 122.
Append the next digit (6) from the dividend to 122 and continue with: 1226 / 221

On to step 6:
221 goes into 1226 5 times with a remainder of 121.
Use 5 as the next digit of our solution. 
Result so far: 695.0
If we take 1105 away from 1226, we end up with 121.
Fetch the next digit (3) from the dividend, attach it to 121 and continue: 1213 / 221

Going ahead to step 7:
When dividing 1213 by 221, we get 5 with a remainder of 108.
Record the quotient 5 as the next digit in the result. 
Result so far: 6955.0
The remainder is 108 after subtracting 1105 from 1213.
Append the next digit (7) from the dividend to 108 and continue with: 1087 / 221

Advancing to step 8:
If we divide 1087 by 221, we get 4 and a remainder of 203.
Put 4 as the next digit of the answer. 
Result so far: 69554.0
Subtract 884 from 1087 to get 203.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2030, and continue the process.

Advancing to step 9:
2030 divided by 221 is 9 with a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 69554.9
Deduct 1989 from 2030 and we're left 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.

Let's proceed to step 10:
410 divided by 221 is 1 with a remainder of 189.
The next digit of our result is 1. 
Result so far: 69554.91
If we subtract 221 from 410, we get 189.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1890, and continue the process.

Step 11:
221 goes into 1890 8 times with a remainder of 122.
The next digit of our result is 8. 
Result so far: 69554.918
If we subtract 1768 from 1890, we get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Let's proceed to step 12:
When dividing 1220 by 221, we get 5 with a remainder of 115.
The next digit of our result is 5. 
Result so far: 69554.9185
Subtract 1105 from 1220 to get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Advancing to step 13:
If we divide 1150 by 221, we get 5 and a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 69554.91855
If we subtract 1105 from 1150, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

The final result is 69554.91855 with a remainder of 4.5e-05.