21580623 ÷ 639 
Let's see how many times 639 fits into 21580623.

Moving on to step 1:
639 goes into 2 0 times with 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.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 639

Let's proceed to step 2:
If we divide 21 by 639, we get 0 and a remainder of 21.
Put 0 as the next digit of the answer. 
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 / 639

On to step 3:
639 goes into 215 0 times with a remainder of 215.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 215, we get 215.
Append the next digit (8) from the dividend to 215 and continue with: 2158 / 639

Going ahead to step 4:
639 goes into 2158 3 times with a remainder of 241.
The next digit of our result is 3. 
Result so far: 3.0
If we take 1917 away from 2158, we end up with 241.
Include the next digit (0) from the dividend after 241, then repeat: 2410 / 639

Going ahead to step 5:
If we divide 2410 by 639, we get 3 and a remainder of 493.
Use 3 as the next digit of our solution. 
Result so far: 33.0
Subtract 1917 from 2410 to get 493.
Append the next digit (6) from the dividend to 493 and continue with: 4936 / 639

Going ahead to step 6:
639 goes into 4936 7 times with a remainder of 463.
Write down 7 as next digit of the result. 
Result so far: 337.0
If we subtract 4473 from 4936, we get 463.
Append the next digit (2) from the dividend to 463 and continue with: 4632 / 639

On to step 7:
The number 639 fits into 4632 7 times, leaving a remainder of 159.
Record the quotient 7 as the next digit in the result. 
Result so far: 3377.0
Subtracting 4473 from 4632 leaves us with 159.
Take the next digit (3) from the dividend and append it to 159, then repeat: 1593 / 639

On to step 8:
The number 639 fits into 1593 2 times, leaving a remainder of 315.
Record the quotient 2 as the next digit in the result. 
Result so far: 33772.0
If we take 1278 away from 1593, we end up with 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Moving on to step 9:
639 can be fit into 3150 4 times, resulting in a remainder of 594.
Use 4 as the next digit of our solution. 
Result so far: 33772.4
If we take 2556 away from 3150, we end up with 594.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5940, and continue the process.

Moving on to step 10:
When dividing 5940 by 639, we get 9 with a remainder of 189.
Write down 9 as next digit of the result. 
Result so far: 33772.49
The remainder is 189 after subtracting 5751 from 5940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1890, and continue the process.

On to step 11:
639 can be fit into 1890 2 times, resulting in a remainder of 612.
The next digit of our result is 2. 
Result so far: 33772.492
Deduct 1278 from 1890 and we're left with 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

Step 12:
The number 639 fits into 6120 9 times, leaving a remainder of 369.
Write down 9 as next digit of the result. 
Result so far: 33772.4929
If we subtract 5751 from 6120, we get 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Going ahead to step 13:
If we divide 3690 by 639, we get 5 and a remainder of 495.
Write down 5 as next digit of the result. 
Result so far: 33772.49295
Deduct 3195 from 3690 and we're left with 495.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4950, and continue the process.

Going ahead to step 14:
If we divide 4950 by 639, we get 7 and a remainder of 477.
The number 7 becomes the next digit in our result. 
Result so far: 33772.492957
The remainder is 477 after subtracting 4473 from 4950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4770, and continue the process.

Let's proceed to step 15:
The number 639 fits into 4770 7 times, leaving a remainder of 297.
Put 7 as the next digit of the answer. 
Result so far: 33772.4929577
Subtracting 4473 from 4770 leaves us with 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

After the division, we end up with 33772.4929577 and a remainder of 2.97e-06.