A:
Positive:
1 x 210500155 x 42100037 x 300714535 x 60142941 x 513415205 x 102683287 x 733451435 x 14669
Negative:
-1 x -21050015-5 x -4210003-7 x -3007145-35 x -601429-41 x -513415-205 x -102683-287 x -73345-1435 x -14669
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 21,050,015, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 21,050,015 | |
| -1 | -21,050,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,050,015.
Example:
1 x 21,050,015 = 21,050,015
and
-1 x -21,050,015 = 21,050,015
Notice both answers equal 21,050,015
With that explanation out of the way, let's continue. Next, we take the number 21,050,015 and divide it by 2:
21,050,015 ÷ 2 = 10,525,007.5
If the quotient is a whole number, then 2 and 10,525,007.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,050,015 | |
| -1 | -21,050,015 |
Now, we try dividing 21,050,015 by 3:
21,050,015 ÷ 3 = 7,016,671.6667
If the quotient is a whole number, then 3 and 7,016,671.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,050,015 | |
| -1 | -21,050,015 |
Let's try dividing by 4:
21,050,015 ÷ 4 = 5,262,503.75
If the quotient is a whole number, then 4 and 5,262,503.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,050,015 | |
| -1 | 21,050,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 41 | 205 | 287 | 1,435 | 14,669 | 73,345 | 102,683 | 513,415 | 601,429 | 3,007,145 | 4,210,003 | 21,050,015 |
| -1 | -5 | -7 | -35 | -41 | -205 | -287 | -1,435 | -14,669 | -73,345 | -102,683 | -513,415 | -601,429 | -3,007,145 | -4,210,003 | -21,050,015 |
Here are some more numbers to try:
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