917578 divided by 21 
Let's see how many times 21 fits into 917578.

On to step 1:
21 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 21

On to step 2:
91 divided by 21 is 4 with a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 84 from 91 and we're left with 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 21

Moving on to step 3:
If we divide 77 by 21, we get 3 and a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 43.0
The remainder is 14 after subtracting 63 from 77.
Fetch the next digit (5) from the dividend, attach it to 14 and continue: 145 / 21

Going ahead to step 4:
When dividing 145 by 21, we get 6 with a remainder of 19.
The number 6 becomes the next digit in our result. 
Result so far: 436.0
Subtracting 126 from 145 leaves us with 19.
Include the next digit (7) from the dividend after 19, then repeat: 197 / 21

On to step 5:
The number 21 fits into 197 9 times, leaving a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 4369.0
Deduct 189 from 197 and we're left with 8.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 21

Moving on to step 6:
88 divided by 21 is 4 with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 43694.0
Subtracting 84 from 88 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 7:
The number 21 fits into 40 1 times, leaving a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 43694.1
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 8:
21 goes into 190 9 times with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 43694.19
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 9:
When dividing 10 by 21, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 43694.19
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 10:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 43694.1904
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 11:
160 divided by 21 is 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 43694.19047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 12:
If we divide 130 by 21, we get 6 and a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 43694.190476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
If we divide 40 by 21, we get 1 and a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 43694.1904761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 14:
If we divide 190 by 21, we get 9 and a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 43694.19047619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 43694.19047619 and a remainder of 1e-09.