We're dividing 21172853 by 403 
We're looking to find how many times 403 goes into 21172853.

Going ahead to step 1:
The number 403 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 403

Moving on to step 2:
When dividing 21 by 403, we get 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Fetch the next digit (1) from the dividend, attach it to 21 and continue: 211 / 403

Advancing to step 3:
When dividing 211 by 403, we get 0 with a remainder of 211.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 211 after subtracting 0 from 211.
Include the next digit (7) from the dividend after 211, then repeat: 2117 / 403

Let's proceed to step 4:
403 goes into 2117 5 times with a remainder of 102.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we take 2015 away from 2117, we end up with 102.
Bring next digit (2) of the dividend behind the 102 and repeat the process: 1022 / 403

Let's proceed to step 5:
When dividing 1022 by 403, we get 2 with a remainder of 216.
Record the quotient 2 as the next digit in the result. 
Result so far: 52.0
Subtracting 806 from 1022 leaves us with 216.
Fetch the next digit (8) from the dividend, attach it to 216 and continue: 2168 / 403

Going ahead to step 6:
2168 divided by 403 is 5 with a remainder of 153.
Record the quotient 5 as the next digit in the result. 
Result so far: 525.0
Deduct 2015 from 2168 and we're left with 153.
Append the next digit (5) from the dividend to 153 and continue with: 1535 / 403

Step 7:
The number 403 fits into 1535 3 times, leaving a remainder of 326.
The next digit of our result is 3. 
Result so far: 5253.0
Subtract 1209 from 1535 to get 326.
Append the next digit (3) from the dividend to 326 and continue with: 3263 / 403

Let's proceed to step 8:
If we divide 3263 by 403, we get 8 and a remainder of 39.
The number 8 becomes the next digit in our result. 
Result so far: 52538.0
If we take 3224 away from 3263, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 9:
403 can be fit into 390 0 times, resulting in a remainder of 390.
Put 0 as the next digit of the answer. 
Result so far: 52538.0
If we subtract 0 from 390, we get 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Let's proceed to step 10:
The number 403 fits into 3900 9 times, leaving a remainder of 273.
The number 9 becomes the next digit in our result. 
Result so far: 52538.09
Deduct 3627 from 3900 and we're left with 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

Advancing to step 11:
When dividing 2730 by 403, we get 6 with a remainder of 312.
The next digit of our result is 6. 
Result so far: 52538.096
Deduct 2418 from 2730 and we're left with 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Moving on to step 12:
The number 403 fits into 3120 7 times, leaving a remainder of 299.
Put 7 as the next digit of the answer. 
Result so far: 52538.0967
If we take 2821 away from 3120, we end up with 299.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2990, and continue the process.

On to step 13:
403 goes into 2990 7 times with a remainder of 169.
The next digit of our result is 7. 
Result so far: 52538.09677
Subtract 2821 from 2990 to get 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

The final outcome is 52538.09677, with a leftover of 0.000169.