We look at the division of 55681443 by 21 
We want to figure out the number of times 55681443 can be divided by 21.

Step 1:
21 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 21

Advancing to step 2:
55 divided by 21 is 2 with a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 42 from 55, we get 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 21

Advancing to step 3:
21 goes into 136 6 times with a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 26.0
If we take 126 away from 136, we end up with 10.
Fetch the next digit (8) from the dividend, attach it to 10 and continue: 108 / 21

Let's proceed to step 4:
108 divided by 21 is 5 with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 265.0
If we take 105 away from 108, we end up with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 21

Step 5:
31 divided by 21 is 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 2651.0
If we take 21 away from 31, we end up with 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 21

Let's proceed to step 6:
21 can be fit into 104 4 times, resulting in a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 26514.0
The remainder is 20 after subtracting 84 from 104.
Grab the next digit (4) from the dividend, add it to 20, then carry on: 204 / 21

Going ahead to step 7:
204 divided by 21 is 9 with a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 265149.0
The remainder is 15 after subtracting 189 from 204.
Bring next digit (3) of the dividend behind the 15 and repeat the process: 153 / 21

On to step 8:
If we divide 153 by 21, we get 7 and a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 2651497.0
The remainder is 6 after subtracting 147 from 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 2651497.2
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 10:
21 goes into 180 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 2651497.28
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 11:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 2651497.285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 2651497.2857
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 13:
If we divide 30 by 21, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 2651497.28571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 14:
90 divided by 21 is 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 2651497.285714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 15:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 2651497.2857142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 16:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 2651497.28571428
Subtracting 168 from 180 leaves us with 12.
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 2651497.28571428, with a leftover of 1.2e-08.