909869 divided by 21 
Let's see how many times 21 fits into 909869.

Going ahead to step 1:
21 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 21

Let's proceed to step 2:
90 divided by 21 is 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 84 from 90 to get 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 21

On to step 3:
The number 21 fits into 69 3 times, leaving a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 43.0
The remainder is 6 after subtracting 63 from 69.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 21

Going ahead to step 4:
21 can be fit into 68 3 times, resulting in a remainder of 5.
The next digit of our result is 3. 
Result so far: 433.0
If we take 63 away from 68, we end up with 5.
Include the next digit (6) from the dividend after 5, then repeat: 56 / 21

On to step 5:
56 divided by 21 is 2 with a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 4332.0
If we subtract 42 from 56, we get 14.
Grab the next digit (9) from the dividend, add it to 14, then carry on: 149 / 21

Advancing to step 6:
149 divided by 21 is 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 43327.0
The remainder is 2 after subtracting 147 from 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
When dividing 20 by 21, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 43327.0
If we take 0 away from 20, we end up 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.

On to step 8:
200 divided by 21 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 43327.09
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 9:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 43327.095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 10:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 43327.0952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
When dividing 80 by 21, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 43327.09523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 12:
If we divide 170 by 21, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 43327.095238
Deduct 168 from 170 and we're left 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.

Moving on to step 13:
20 divided by 21 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 43327.095238
Deduct 0 from 20 and we're left 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.

On to step 14:
The number 21 fits into 200 9 times, leaving a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 43327.09523809
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Our division results in 43327.09523809 with a remaining 1.1e-08.