We're dividing 56186726 by 21 
We want to figure out the number of times 56186726 can be divided by 21.

Going ahead to step 1:
21 goes into 5 0 times with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (6) from the dividend after 5, then repeat: 56 / 21

Let's proceed to step 2:
If we divide 56 by 21, we get 2 and a remainder of 14.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 42 from 56 and we're left with 14.
Include the next digit (1) from the dividend after 14, then repeat: 141 / 21

Moving on to step 3:
If we divide 141 by 21, we get 6 and a remainder of 15.
Use 6 as the next digit of our solution. 
Result so far: 26.0
Deduct 126 from 141 and we're left with 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 21

Advancing to step 4:
158 divided by 21 is 7 with a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 267.0
Subtracting 147 from 158 leaves us with 11.
Include the next digit (6) from the dividend after 11, then repeat: 116 / 21

Advancing to step 5:
21 goes into 116 5 times with a remainder of 11.
Use 5 as the next digit of our solution. 
Result so far: 2675.0
Subtract 105 from 116 to get 11.
Append the next digit (7) from the dividend to 11 and continue with: 117 / 21

On to step 6:
21 can be fit into 117 5 times, resulting in a remainder of 12.
The number 5 becomes the next digit in our result. 
Result so far: 26755.0
Deduct 105 from 117 and we're left with 12.
Fetch the next digit (2) from the dividend, attach it to 12 and continue: 122 / 21

Going ahead to step 7:
If we divide 122 by 21, we get 5 and a remainder of 17.
Write down 5 as next digit of the result. 
Result so far: 267555.0
Deduct 105 from 122 and we're left with 17.
Include the next digit (6) from the dividend after 17, then repeat: 176 / 21

Going ahead to step 8:
When dividing 176 by 21, we get 8 with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 2675558.0
If we take 168 away from 176, 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.

On to step 9:
The number 21 fits into 80 3 times, leaving a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 2675558.3
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 10:
21 goes into 170 8 times with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 2675558.38
Subtracting 168 from 170 leaves us 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.

On to step 11:
21 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 2675558.38
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 12:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 2675558.3809
Deduct 189 from 200 and we're left 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.

Step 13:
If we divide 110 by 21, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 2675558.38095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 14:
50 divided by 21 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 2675558.380952
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.

Let's proceed to step 15:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 2675558.3809523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 16:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 2675558.38095238
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.

The final outcome is 2675558.38095238, with a leftover of 2e-09.