We divide 334601 by 21
The aim is to understand the frequency of 21 in 334601.

Step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 21

Step 2:
21 can be fit into 33 1 times, resulting in a remainder of 12.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 12 after subtracting 21 from 33.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 21

Moving on to step 3:
When dividing 124 by 21, we get 5 with a remainder of 19.
The next digit of our result is 5. 
Result so far: 15.0
Deduct 105 from 124 and we're left with 19.
Grab the next digit (6) from the dividend, add it to 19, then carry on: 196 / 21

Going ahead to step 4:
196 divided by 21 is 9 with a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 159.0
If we subtract 189 from 196, we get 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 21

On to step 5:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 1593.0
Deduct 63 from 70 and we're left with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 21

On to step 6:
The number 21 fits into 71 3 times, leaving a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 15933.0
Subtract 63 from 71 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 7:
When dividing 80 by 21, we get 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 15933.3
If we subtract 63 from 80, we 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.

Moving on to step 8:
21 goes into 170 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 15933.38
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
When dividing 20 by 21, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 15933.38
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
200 divided by 21 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 15933.3809
Subtract 189 from 200 to get 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 11:
If we divide 110 by 21, we get 5 and a remainder of 5.
The next digit of our result is 5. 
Result so far: 15933.38095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 12:
21 goes into 50 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 15933.380952
If we subtract 42 from 50, we get 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 13:
80 divided by 21 is 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 15933.3809523
If we take 63 away from 80, we end up 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.

Going ahead to step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
The next digit of our result is 8. 
Result so far: 15933.38095238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The quotient of the division is 15933.38095238, and the remainder is 2e-09.