We're dividing 21148661 by 171 
Let's see how many times 171 fits into 21148661.

Advancing to step 1:
The number 171 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 171

On to step 2:
When dividing 21 by 171, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (1) from the dividend after 21, then repeat: 211 / 171

On to step 3:
171 goes into 211 1 times with a remainder of 40.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 171 from 211 to get 40.
Bring next digit (4) of the dividend behind the 40 and repeat the process: 404 / 171

Step 4:
When dividing 404 by 171, we get 2 with a remainder of 62.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we subtract 342 from 404, we get 62.
Include the next digit (8) from the dividend after 62, then repeat: 628 / 171

On to step 5:
171 can be fit into 628 3 times, resulting in a remainder of 115.
The next digit of our result is 3. 
Result so far: 123.0
If we subtract 513 from 628, we get 115.
Include the next digit (6) from the dividend after 115, then repeat: 1156 / 171

On to step 6:
1156 divided by 171 is 6 with a remainder of 130.
Use 6 as the next digit of our solution. 
Result so far: 1236.0
If we take 1026 away from 1156, we end up with 130.
Include the next digit (6) from the dividend after 130, then repeat: 1306 / 171

Let's proceed to step 7:
171 can be fit into 1306 7 times, resulting in a remainder of 109.
Use 7 as the next digit of our solution. 
Result so far: 12367.0
If we take 1197 away from 1306, we end up with 109.
Append the next digit (1) from the dividend to 109 and continue with: 1091 / 171

Step 8:
If we divide 1091 by 171, we get 6 and a remainder of 65.
Use 6 as the next digit of our solution. 
Result so far: 123676.0
Subtract 1026 from 1091 to get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 9:
650 divided by 171 is 3 with a remainder of 137.
The next digit of our result is 3. 
Result so far: 123676.3
Deduct 513 from 650 and we're left with 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Advancing to step 10:
If we divide 1370 by 171, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 123676.38
If we take 1368 away from 1370, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 11:
The number 171 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 123676.38
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 12:
200 divided by 171 is 1 with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 123676.3801
If we subtract 171 from 200, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 13:
171 goes into 290 1 times with a remainder of 119.
The number 1 becomes the next digit in our result. 
Result so far: 123676.38011
The remainder is 119 after subtracting 171 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

After the division, we end up with 123676.38011 and a remainder of 0.000119.