We look at the division of 667371 by 21 
We're looking to find how many times 21 goes into 667371.

Advancing to step 1:
21 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 21

Step 2:
The number 21 fits into 66 3 times, leaving a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 63 from 66 and we're left with 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 21

Going ahead to step 3:
The number 21 fits into 37 1 times, leaving a remainder of 16.
The next digit of our result is 1. 
Result so far: 31.0
Deduct 21 from 37 and we're left with 16.
Take the next digit (3) from the dividend and append it to 16, then repeat: 163 / 21

Advancing to step 4:
The number 21 fits into 163 7 times, leaving a remainder of 16.
Write down 7 as next digit of the result. 
Result so far: 317.0
Subtract 147 from 163 to get 16.
Append the next digit (7) from the dividend to 16 and continue with: 167 / 21

Let's proceed to step 5:
21 can be fit into 167 7 times, resulting in a remainder of 20.
Use 7 as the next digit of our solution. 
Result so far: 3177.0
If we subtract 147 from 167, we get 20.
Take the next digit (1) from the dividend and append it to 20, then repeat: 201 / 21

Moving on to step 6:
If we divide 201 by 21, we get 9 and a remainder of 12.
Put 9 as the next digit of the answer. 
Result so far: 31779.0
If we take 189 away from 201, we end up 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.

Let's proceed to step 7:
When dividing 120 by 21, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 31779.5
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
When dividing 150 by 21, we get 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 31779.57
Deduct 147 from 150 and we're left 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 9:
When dividing 30 by 21, we get 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 31779.571
The remainder is 9 after subtracting 21 from 30.
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 10:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 31779.5714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 31779.57142
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 12:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 31779.571428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 13:
120 divided by 21 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 31779.5714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 14:
When dividing 150 by 21, we get 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 31779.57142857
Deduct 147 from 150 and we're left 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.

In conclusion, the division gives 31779.57142857 with a balance of 3e-09.