21018 divided by 18 
Let's see how many times 18 fits into 21018.

Step 1:
When dividing 2 by 18, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 18

Advancing to step 2:
18 goes into 21 1 times with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 18 from 21 and we're left with 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 18

Advancing to step 3:
When dividing 30 by 18, we get 1 with a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 11.0
If we take 18 away from 30, we end up with 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 18

Step 4:
121 divided by 18 is 6 with a remainder of 13.
The number 6 becomes the next digit in our result. 
Result so far: 116.0
The remainder is 13 after subtracting 108 from 121.
Take the next digit (8) from the dividend and append it to 13, then repeat: 138 / 18

Let's proceed to step 5:
When dividing 138 by 18, we get 7 with a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 1167.0
If we subtract 126 from 138, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 6:
When dividing 120 by 18, we get 6 with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 1167.6
The remainder is 12 after subtracting 108 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
18 can be fit into 120 6 times, resulting in a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 1167.66
The remainder is 12 after subtracting 108 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 1167.66, with a leftover of 0.012.