We look at the division of 21570535 by 661 
Let's see how many times 661 fits into 21570535.

Step 1:
2 divided by 661 is 0 with a remainder of 2.
The next digit of our result is 0. 
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 / 661

Going ahead to step 2:
The number 661 fits into 21 0 times, leaving a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 661

Advancing to step 3:
The number 661 fits into 215 0 times, leaving a remainder of 215.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 215 and we're left with 215.
Take the next digit (7) from the dividend and append it to 215, then repeat: 2157 / 661

On to step 4:
If we divide 2157 by 661, we get 3 and a remainder of 174.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 1983 away from 2157, we end up with 174.
Append the next digit (0) from the dividend to 174 and continue with: 1740 / 661

Advancing to step 5:
The number 661 fits into 1740 2 times, leaving a remainder of 418.
The next digit of our result is 2. 
Result so far: 32.0
Subtract 1322 from 1740 to get 418.
Grab the next digit (5) from the dividend, add it to 418, then carry on: 4185 / 661

Advancing to step 6:
661 goes into 4185 6 times with a remainder of 219.
The number 6 becomes the next digit in our result. 
Result so far: 326.0
If we subtract 3966 from 4185, we get 219.
Append the next digit (3) from the dividend to 219 and continue with: 2193 / 661

On to step 7:
If we divide 2193 by 661, we get 3 and a remainder of 210.
Use 3 as the next digit of our solution. 
Result so far: 3263.0
Subtracting 1983 from 2193 leaves us with 210.
Append the next digit (5) from the dividend to 210 and continue with: 2105 / 661

Moving on to step 8:
661 can be fit into 2105 3 times, resulting in a remainder of 122.
The next digit of our result is 3. 
Result so far: 32633.0
Subtract 1983 from 2105 to 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.

Step 9:
1220 divided by 661 is 1 with a remainder of 559.
The next digit of our result is 1. 
Result so far: 32633.1
Subtract 661 from 1220 to get 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

Going ahead to step 10:
661 can be fit into 5590 8 times, resulting in a remainder of 302.
The next digit of our result is 8. 
Result so far: 32633.18
If we subtract 5288 from 5590, we get 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

On to step 11:
661 goes into 3020 4 times with a remainder of 376.
The number 4 becomes the next digit in our result. 
Result so far: 32633.184
The remainder is 376 after subtracting 2644 from 3020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Advancing to step 12:
If we divide 3760 by 661, we get 5 and a remainder of 455.
Record the quotient 5 as the next digit in the result. 
Result so far: 32633.1845
If we take 3305 away from 3760, we end up with 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Step 13:
4550 divided by 661 is 6 with a remainder of 584.
Use 6 as the next digit of our solution. 
Result so far: 32633.18456
If we take 3966 away from 4550, we end up with 584.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

Let's proceed to step 14:
5840 divided by 661 is 8 with a remainder of 552.
Put 8 as the next digit of the answer. 
Result so far: 32633.184568
Subtracting 5288 from 5840 leaves us with 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Advancing to step 15:
When dividing 5520 by 661, we get 8 with a remainder of 232.
Write down 8 as next digit of the result. 
Result so far: 32633.1845688
If we take 5288 away from 5520, we end up with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Our division results in 32633.1845688 with a remaining 2.32e-06.