We look at the division of 81834986 by 21 
Let's see how many times 21 fits into 81834986.

Let's proceed to step 1:
21 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 21

Moving on to step 2:
The number 21 fits into 81 3 times, leaving a remainder of 18.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 63 from 81, we get 18.
Append the next digit (8) from the dividend to 18 and continue with: 188 / 21

Going ahead to step 3:
When dividing 188 by 21, we get 8 with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 38.0
If we subtract 168 from 188, we get 20.
Include the next digit (3) from the dividend after 20, then repeat: 203 / 21

Moving on to step 4:
If we divide 203 by 21, we get 9 and a remainder of 14.
Put 9 as the next digit of the answer. 
Result so far: 389.0
Subtracting 189 from 203 leaves us with 14.
Include the next digit (4) from the dividend after 14, then repeat: 144 / 21

On to step 5:
The number 21 fits into 144 6 times, leaving a remainder of 18.
The next digit of our result is 6. 
Result so far: 3896.0
Deduct 126 from 144 and we're left with 18.
Take the next digit (9) from the dividend and append it to 18, then repeat: 189 / 21

On to step 6:
When dividing 189 by 21, we get 9 with a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 38969.0
Deduct 189 from 189 and we're left with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 21

Let's proceed to step 7:
When dividing 8 by 21, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 389690.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 21

Let's proceed to step 8:
When dividing 86 by 21, we get 4 with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 3896904.0
If we take 84 away from 86, we end up 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.

Step 9:
If we divide 20 by 21, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 3896904.0
Subtracting 0 from 20 leaves us 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.

Moving on to step 10:
When dividing 200 by 21, we get 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 3896904.09
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 11:
When dividing 110 by 21, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 3896904.095
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.

Step 12:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 3896904.0952
Subtracting 42 from 50 leaves us 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.

Advancing to step 13:
80 divided by 21 is 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 3896904.09523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 14:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 3896904.095238
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 15:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 3896904.095238
Subtracting 0 from 20 leaves us 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.

Going ahead to step 16:
When dividing 200 by 21, we get 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 3896904.09523809
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.

Our division results in 3896904.09523809 with a remaining 1.1e-08.