21377 ÷ 1 
Our goal is to divide 21377 by 1.

Going ahead to step 1:
2 divided by 1 is 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 2 from 2 leaves us with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 1

Moving on to step 2:
1 goes into 1 1 times with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 21.0
Subtracting 1 from 1 leaves us with 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 1

Moving on to step 3:
If we divide 3 by 1, we get 3 and a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 213.0
If we take 3 away from 3, we end up with 0.
Take the next digit (7) from the dividend and append it to 0, then repeat: 7 / 1

Moving on to step 4:
If we divide 7 by 1, we get 7 and a remainder of 0.
Record the quotient 7 as the next digit in the result. 
Result so far: 2137.0
Subtracting 7 from 7 leaves us with 0.
Grab the next digit (7) from the dividend, add it to 0, then carry on: 7 / 1

Let's proceed to step 5:
When dividing 7 by 1, we get 7 with a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 21377.0
Subtracting 7 from 7 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 6:
When dividing 0 by 1, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 21377.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
1 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 21377.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 21377.0 with a remainder of 0.0.