86690570 ÷ 321 
Let's see how many times 321 fits into 86690570.

On to step 1:
8 divided by 321 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 321

Going ahead to step 2:
86 divided by 321 is 0 with a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Take the next digit (6) from the dividend and append it to 86, then repeat: 866 / 321

Step 3:
866 divided by 321 is 2 with a remainder of 224.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 224 after subtracting 642 from 866.
Fetch the next digit (9) from the dividend, attach it to 224 and continue: 2249 / 321

Advancing to step 4:
321 can be fit into 2249 7 times, resulting in a remainder of 2.
The next digit of our result is 7. 
Result so far: 27.0
If we take 2247 away from 2249, we end up with 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 321

Moving on to step 5:
The number 321 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 270.0
If we subtract 0 from 20, we get 20.
Bring next digit (5) of the dividend behind the 20 and repeat the process: 205 / 321

Step 6:
321 can be fit into 205 0 times, resulting in a remainder of 205.
The next digit of our result is 0. 
Result so far: 2700.0
If we take 0 away from 205, we end up with 205.
Take the next digit (7) from the dividend and append it to 205, then repeat: 2057 / 321

Going ahead to step 7:
321 goes into 2057 6 times with a remainder of 131.
Write down 6 as next digit of the result. 
Result so far: 27006.0
Subtract 1926 from 2057 to get 131.
Include the next digit (0) from the dividend after 131, then repeat: 1310 / 321

Moving on to step 8:
321 goes into 1310 4 times with a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 270064.0
Deduct 1284 from 1310 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 9:
321 goes into 260 0 times with a remainder of 260.
The number 0 becomes the next digit in our result. 
Result so far: 270064.0
If we subtract 0 from 260, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Moving on to step 10:
When dividing 2600 by 321, we get 8 with a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 270064.08
Subtracting 2568 from 2600 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 11:
When dividing 320 by 321, we get 0 with a remainder of 320.
The number 0 becomes the next digit in our result. 
Result so far: 270064.08
Deduct 0 from 320 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Let's proceed to step 12:
When dividing 3200 by 321, we get 9 with a remainder of 311.
Write down 9 as next digit of the result. 
Result so far: 270064.0809
The remainder is 311 after subtracting 2889 from 3200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

Going ahead to step 13:
3110 divided by 321 is 9 with a remainder of 221.
Write down 9 as next digit of the result. 
Result so far: 270064.08099
Deduct 2889 from 3110 and we're left with 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

The quotient of the division is 270064.08099, and the remainder is 0.000221.