21238582 ÷ 453 
Our goal is to divide 21238582 by 453.

Let's proceed to step 1:
2 divided by 453 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
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 / 453

Moving on to step 2:
21 divided by 453 is 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 453

Let's proceed to step 3:
When dividing 212 by 453, we get 0 with a remainder of 212.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 212 after subtracting 0 from 212.
Grab the next digit (3) from the dividend, add it to 212, then carry on: 2123 / 453

Step 4:
453 goes into 2123 4 times with a remainder of 311.
The next digit of our result is 4. 
Result so far: 4.0
If we take 1812 away from 2123, we end up with 311.
Fetch the next digit (8) from the dividend, attach it to 311 and continue: 3118 / 453

Let's proceed to step 5:
453 goes into 3118 6 times with a remainder of 400.
Write down 6 as next digit of the result. 
Result so far: 46.0
The remainder is 400 after subtracting 2718 from 3118.
Fetch the next digit (5) from the dividend, attach it to 400 and continue: 4005 / 453

Step 6:
453 goes into 4005 8 times with a remainder of 381.
The number 8 becomes the next digit in our result. 
Result so far: 468.0
Subtracting 3624 from 4005 leaves us with 381.
Append the next digit (8) from the dividend to 381 and continue with: 3818 / 453

Moving on to step 7:
453 goes into 3818 8 times with a remainder of 194.
The next digit of our result is 8. 
Result so far: 4688.0
Deduct 3624 from 3818 and we're left with 194.
Include the next digit (2) from the dividend after 194, then repeat: 1942 / 453

Moving on to step 8:
453 can be fit into 1942 4 times, resulting in a remainder of 130.
The next digit of our result is 4. 
Result so far: 46884.0
If we take 1812 away from 1942, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Let's proceed to step 9:
When dividing 1300 by 453, we get 2 with a remainder of 394.
Record the quotient 2 as the next digit in the result. 
Result so far: 46884.2
Subtracting 906 from 1300 leaves us with 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Let's proceed to step 10:
When dividing 3940 by 453, we get 8 with a remainder of 316.
Put 8 as the next digit of the answer. 
Result so far: 46884.28
Subtract 3624 from 3940 to get 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Going ahead to step 11:
3160 divided by 453 is 6 with a remainder of 442.
Record the quotient 6 as the next digit in the result. 
Result so far: 46884.286
If we subtract 2718 from 3160, we get 442.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4420, and continue the process.

Advancing to step 12:
If we divide 4420 by 453, we get 9 and a remainder of 343.
The number 9 becomes the next digit in our result. 
Result so far: 46884.2869
Subtracting 4077 from 4420 leaves us with 343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3430, and continue the process.

Advancing to step 13:
When dividing 3430 by 453, we get 7 with a remainder of 259.
The next digit of our result is 7. 
Result so far: 46884.28697
The remainder is 259 after subtracting 3171 from 3430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Advancing to step 14:
When dividing 2590 by 453, we get 5 with a remainder of 325.
Record the quotient 5 as the next digit in the result. 
Result so far: 46884.286975
Subtract 2265 from 2590 to get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Moving on to step 15:
453 goes into 3250 7 times with a remainder of 79.
The number 7 becomes the next digit in our result. 
Result so far: 46884.2869757
Deduct 3171 from 3250 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Going ahead to step 16:
453 goes into 790 1 times with a remainder of 337.
Record the quotient 1 as the next digit in the result. 
Result so far: 46884.28697571
Subtract 453 from 790 to get 337.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3370, and continue the process.

The final outcome is 46884.28697571, with a leftover of 3.37e-07.