337197 divided by 21 
We're looking to find how many times 21 goes into 337197.

Step 1:
21 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 21

On to step 2:
The number 21 fits into 33 1 times, leaving a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 21 from 33 and we're left with 12.
Bring next digit (7) of the dividend behind the 12 and repeat the process: 127 / 21

On to step 3:
21 can be fit into 127 6 times, resulting in a remainder of 1.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
Deduct 126 from 127 and we're left with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 21

Going ahead to step 4:
11 divided by 21 is 0 with a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 160.0
Subtracting 0 from 11 leaves us with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 21

Let's proceed to step 5:
119 divided by 21 is 5 with a remainder of 14.
Use 5 as the next digit of our solution. 
Result so far: 1605.0
Deduct 105 from 119 and we're left with 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 21

Let's proceed to step 6:
The number 21 fits into 147 7 times, leaving a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 16057.0
Subtract 147 from 147 to 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.

On to step 7:
If we divide 0 by 21, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 16057.0
Subtract 0 from 0 to 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 8:
21 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 16057.0
Subtract 0 from 0 to 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.

After the division, we end up with 16057.0 and a remainder of 0.0.