We look at the division of 21011137 by 686 
The aim is to understand the frequency of 686 in 21011137.

Moving on to step 1:
2 divided by 686 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 686

Step 2:
When dividing 21 by 686, we get 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (0) from the dividend after 21, then repeat: 210 / 686

Let's proceed to step 3:
686 goes into 210 0 times with a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 210, we get 210.
Bring next digit (1) of the dividend behind the 210 and repeat the process: 2101 / 686

Going ahead to step 4:
The number 686 fits into 2101 3 times, leaving a remainder of 43.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 2058 from 2101 leaves us with 43.
Bring next digit (1) of the dividend behind the 43 and repeat the process: 431 / 686

Step 5:
The number 686 fits into 431 0 times, leaving a remainder of 431.
Put 0 as the next digit of the answer. 
Result so far: 30.0
The remainder is 431 after subtracting 0 from 431.
Include the next digit (1) from the dividend after 431, then repeat: 4311 / 686

Moving on to step 6:
When dividing 4311 by 686, we get 6 with a remainder of 195.
The next digit of our result is 6. 
Result so far: 306.0
Subtracting 4116 from 4311 leaves us with 195.
Append the next digit (3) from the dividend to 195 and continue with: 1953 / 686

On to step 7:
When dividing 1953 by 686, we get 2 with a remainder of 581.
Put 2 as the next digit of the answer. 
Result so far: 3062.0
Subtract 1372 from 1953 to get 581.
Fetch the next digit (7) from the dividend, attach it to 581 and continue: 5817 / 686

Going ahead to step 8:
686 goes into 5817 8 times with a remainder of 329.
Record the quotient 8 as the next digit in the result. 
Result so far: 30628.0
Subtracting 5488 from 5817 leaves us with 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Advancing to step 9:
3290 divided by 686 is 4 with a remainder of 546.
Record the quotient 4 as the next digit in the result. 
Result so far: 30628.4
The remainder is 546 after subtracting 2744 from 3290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Let's proceed to step 10:
686 goes into 5460 7 times with a remainder of 658.
Put 7 as the next digit of the answer. 
Result so far: 30628.47
Subtracting 4802 from 5460 leaves us with 658.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6580, and continue the process.

Going ahead to step 11:
686 can be fit into 6580 9 times, resulting in a remainder of 406.
Write down 9 as next digit of the result. 
Result so far: 30628.479
Subtracting 6174 from 6580 leaves us with 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

On to step 12:
The number 686 fits into 4060 5 times, leaving a remainder of 630.
Put 5 as the next digit of the answer. 
Result so far: 30628.4795
If we take 3430 away from 4060, we end up with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Let's proceed to step 13:
686 goes into 6300 9 times with a remainder of 126.
Use 9 as the next digit of our solution. 
Result so far: 30628.47959
Deduct 6174 from 6300 and we're left with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Step 14:
The number 686 fits into 1260 1 times, leaving a remainder of 574.
Put 1 as the next digit of the answer. 
Result so far: 30628.479591
If we take 686 away from 1260, we end up with 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

Moving on to step 15:
The number 686 fits into 5740 8 times, leaving a remainder of 252.
Put 8 as the next digit of the answer. 
Result so far: 30628.4795918
Subtracting 5488 from 5740 leaves us with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Moving on to step 16:
If we divide 2520 by 686, we get 3 and a remainder of 462.
Write down 3 as next digit of the result. 
Result so far: 30628.47959183
If we subtract 2058 from 2520, we get 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

After the division, we end up with 30628.47959183 and a remainder of 4.62e-07.