21678027 ÷ 686 
We're looking to find how many times 686 goes into 21678027.

Step 1:
686 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 686

Step 2:
When dividing 21 by 686, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Take the next digit (6) from the dividend and append it to 21, then repeat: 216 / 686

Step 3:
If we divide 216 by 686, we get 0 and a remainder of 216.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 216 and we're left with 216.
Include the next digit (7) from the dividend after 216, then repeat: 2167 / 686

Moving on to step 4:
686 can be fit into 2167 3 times, resulting in a remainder of 109.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 2058 from 2167 to get 109.
Take the next digit (8) from the dividend and append it to 109, then repeat: 1098 / 686

Let's proceed to step 5:
If we divide 1098 by 686, we get 1 and a remainder of 412.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
Subtract 686 from 1098 to get 412.
Include the next digit (0) from the dividend after 412, then repeat: 4120 / 686

Going ahead to step 6:
When dividing 4120 by 686, we get 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 316.0
Subtract 4116 from 4120 to get 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 686

Let's proceed to step 7:
If we divide 42 by 686, we get 0 and a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 3160.0
The remainder is 42 after subtracting 0 from 42.
Append the next digit (7) from the dividend to 42 and continue with: 427 / 686

Moving on to step 8:
If we divide 427 by 686, we get 0 and a remainder of 427.
Write down 0 as next digit of the result. 
Result so far: 31600.0
If we take 0 away from 427, we end up with 427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4270, and continue the process.

Let's proceed to step 9:
When dividing 4270 by 686, we get 6 with a remainder of 154.
The number 6 becomes the next digit in our result. 
Result so far: 31600.6
Deduct 4116 from 4270 and we're left with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Step 10:
The number 686 fits into 1540 2 times, leaving a remainder of 168.
Use 2 as the next digit of our solution. 
Result so far: 31600.62
If we subtract 1372 from 1540, we get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Moving on to step 11:
The number 686 fits into 1680 2 times, leaving a remainder of 308.
Use 2 as the next digit of our solution. 
Result so far: 31600.622
Subtract 1372 from 1680 to get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

The quotient of the division is 31600.622, and the remainder is 0.0308.