We look at the division of 21154671 by 810 
We're looking to find how many times 810 goes into 21154671.

Moving on to step 1:
If we divide 2 by 810, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 810

Step 2:
21 divided by 810 is 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (1) from the dividend, add it to 21, then carry on: 211 / 810

On to step 3:
810 goes into 211 0 times with a remainder of 211.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 211 to get 211.
Append the next digit (5) from the dividend to 211 and continue with: 2115 / 810

Let's proceed to step 4:
810 can be fit into 2115 2 times, resulting in a remainder of 495.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 495 after subtracting 1620 from 2115.
Append the next digit (4) from the dividend to 495 and continue with: 4954 / 810

Moving on to step 5:
4954 divided by 810 is 6 with a remainder of 94.
Write down 6 as next digit of the result. 
Result so far: 26.0
If we take 4860 away from 4954, we end up with 94.
Take the next digit (6) from the dividend and append it to 94, then repeat: 946 / 810

Advancing to step 6:
The number 810 fits into 946 1 times, leaving a remainder of 136.
Put 1 as the next digit of the answer. 
Result so far: 261.0
The remainder is 136 after subtracting 810 from 946.
Bring next digit (7) of the dividend behind the 136 and repeat the process: 1367 / 810

On to step 7:
810 can be fit into 1367 1 times, resulting in a remainder of 557.
The number 1 becomes the next digit in our result. 
Result so far: 2611.0
The remainder is 557 after subtracting 810 from 1367.
Grab the next digit (1) from the dividend, add it to 557, then carry on: 5571 / 810

Step 8:
If we divide 5571 by 810, we get 6 and a remainder of 711.
Put 6 as the next digit of the answer. 
Result so far: 26116.0
Subtracting 4860 from 5571 leaves us with 711.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7110, and continue the process.

Advancing to step 9:
When dividing 7110 by 810, we get 8 with a remainder of 630.
Write down 8 as next digit of the result. 
Result so far: 26116.8
Deduct 6480 from 7110 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Advancing to step 10:
When dividing 6300 by 810, we get 7 with a remainder of 630.
Write down 7 as next digit of the result. 
Result so far: 26116.87
Deduct 5670 from 6300 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Let's proceed to step 11:
If we divide 6300 by 810, we get 7 and a remainder of 630.
The next digit of our result is 7. 
Result so far: 26116.877
Deduct 5670 from 6300 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

The quotient of the division is 26116.877, and the remainder is 0.063.