We look at the division of 21214785 by 139 
We're looking to find how many times 139 goes into 21214785.

Let's proceed to step 1:
2 divided by 139 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 139

Going ahead to step 2:
139 can be fit into 21 0 times, resulting in a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 139

Moving on to step 3:
139 can be fit into 212 1 times, resulting in a remainder of 73.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 139 from 212 and we're left with 73.
Take the next digit (1) from the dividend and append it to 73, then repeat: 731 / 139

Going ahead to step 4:
If we divide 731 by 139, we get 5 and a remainder of 36.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we subtract 695 from 731, we get 36.
Append the next digit (4) from the dividend to 36 and continue with: 364 / 139

Let's proceed to step 5:
139 goes into 364 2 times with a remainder of 86.
Record the quotient 2 as the next digit in the result. 
Result so far: 152.0
If we take 278 away from 364, we end up with 86.
Grab the next digit (7) from the dividend, add it to 86, then carry on: 867 / 139

Step 6:
867 divided by 139 is 6 with a remainder of 33.
Use 6 as the next digit of our solution. 
Result so far: 1526.0
Deduct 834 from 867 and we're left with 33.
Take the next digit (8) from the dividend and append it to 33, then repeat: 338 / 139

Going ahead to step 7:
The number 139 fits into 338 2 times, leaving a remainder of 60.
Write down 2 as next digit of the result. 
Result so far: 15262.0
The remainder is 60 after subtracting 278 from 338.
Append the next digit (5) from the dividend to 60 and continue with: 605 / 139

Going ahead to step 8:
When dividing 605 by 139, we get 4 with a remainder of 49.
Record the quotient 4 as the next digit in the result. 
Result so far: 152624.0
Deduct 556 from 605 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 9:
If we divide 490 by 139, we get 3 and a remainder of 73.
The next digit of our result is 3. 
Result so far: 152624.3
If we subtract 417 from 490, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 10:
When dividing 730 by 139, we get 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 152624.35
Deduct 695 from 730 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 11:
When dividing 350 by 139, we get 2 with a remainder of 72.
The next digit of our result is 2. 
Result so far: 152624.352
Subtract 278 from 350 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 12:
The number 139 fits into 720 5 times, leaving a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 152624.3525
If we subtract 695 from 720, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 13:
The number 139 fits into 250 1 times, leaving a remainder of 111.
The number 1 becomes the next digit in our result. 
Result so far: 152624.35251
The remainder is 111 after subtracting 139 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Advancing to step 14:
139 can be fit into 1110 7 times, resulting in a remainder of 137.
The next digit of our result is 7. 
Result so far: 152624.352517
Deduct 973 from 1110 and we're left with 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

On to step 15:
139 can be fit into 1370 9 times, resulting in a remainder of 119.
The number 9 becomes the next digit in our result. 
Result so far: 152624.3525179
Deduct 1251 from 1370 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Step 16:
139 goes into 1190 8 times with a remainder of 78.
Write down 8 as next digit of the result. 
Result so far: 152624.35251798
Subtract 1112 from 1190 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

The final outcome is 152624.35251798, with a leftover of 7.8e-08.