Let's divide 15816081 by 221
We're looking to find how many times 221 goes into 15816081.

Step 1:
When dividing 1 by 221, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 221

On to step 2:
When dividing 15 by 221, we get 0 with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Take the next digit (8) from the dividend and append it to 15, then repeat: 158 / 221

Moving on to step 3:
The number 221 fits into 158 0 times, leaving a remainder of 158.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 158 to get 158.
Append the next digit (1) from the dividend to 158 and continue with: 1581 / 221

Going ahead to step 4:
When dividing 1581 by 221, we get 7 with a remainder of 34.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 34 after subtracting 1547 from 1581.
Take the next digit (6) from the dividend and append it to 34, then repeat: 346 / 221

Step 5:
If we divide 346 by 221, we get 1 and a remainder of 125.
The next digit of our result is 1. 
Result so far: 71.0
If we take 221 away from 346, we end up with 125.
Include the next digit (0) from the dividend after 125, then repeat: 1250 / 221

Step 6:
If we divide 1250 by 221, we get 5 and a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 715.0
Deduct 1105 from 1250 and we're left with 145.
Fetch the next digit (8) from the dividend, attach it to 145 and continue: 1458 / 221

Let's proceed to step 7:
221 goes into 1458 6 times with a remainder of 132.
The next digit of our result is 6. 
Result so far: 7156.0
Subtracting 1326 from 1458 leaves us with 132.
Take the next digit (1) from the dividend and append it to 132, then repeat: 1321 / 221

Step 8:
When dividing 1321 by 221, we get 5 with a remainder of 216.
Record the quotient 5 as the next digit in the result. 
Result so far: 71565.0
Deduct 1105 from 1321 and we're left with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Moving on to step 9:
When dividing 2160 by 221, we get 9 with a remainder of 171.
Record the quotient 9 as the next digit in the result. 
Result so far: 71565.9
Subtract 1989 from 2160 to get 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Moving on to step 10:
221 goes into 1710 7 times with a remainder of 163.
The next digit of our result is 7. 
Result so far: 71565.97
Deduct 1547 from 1710 and we're left with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Step 11:
1630 divided by 221 is 7 with a remainder of 83.
Write down 7 as next digit of the result. 
Result so far: 71565.977
If we subtract 1547 from 1630, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

After the division, we end up with 71565.977 and a remainder of 0.0083.