A:
Positive:
1 x 214000155 x 42800037 x 305714513 x 164615535 x 61142949 x 43673565 x 32923191 x 235165245 x 87347455 x 47033637 x 335953185 x 6719
Negative:
-1 x -21400015-5 x -4280003-7 x -3057145-13 x -1646155-35 x -611429-49 x -436735-65 x -329231-91 x -235165-245 x -87347-455 x -47033-637 x -33595-3185 x -6719
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 21,400,015, 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 | 21,400,015 | |
| -1 | -21,400,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,400,015.
Example:
1 x 21,400,015 = 21,400,015
and
-1 x -21,400,015 = 21,400,015
Notice both answers equal 21,400,015
With that explanation out of the way, let's continue. Next, we take the number 21,400,015 and divide it by 2:
21,400,015 ÷ 2 = 10,700,007.5
If the quotient is a whole number, then 2 and 10,700,007.5 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 | 21,400,015 | |
| -1 | -21,400,015 |
Now, we try dividing 21,400,015 by 3:
21,400,015 ÷ 3 = 7,133,338.3333
If the quotient is a whole number, then 3 and 7,133,338.3333 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 | 21,400,015 | |
| -1 | -21,400,015 |
Let's try dividing by 4:
21,400,015 ÷ 4 = 5,350,003.75
If the quotient is a whole number, then 4 and 5,350,003.75 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 | 21,400,015 | |
| -1 | 21,400,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 13 | 35 | 49 | 65 | 91 | 245 | 455 | 637 | 3,185 | 6,719 | 33,595 | 47,033 | 87,347 | 235,165 | 329,231 | 436,735 | 611,429 | 1,646,155 | 3,057,145 | 4,280,003 | 21,400,015 |
| -1 | -5 | -7 | -13 | -35 | -49 | -65 | -91 | -245 | -455 | -637 | -3,185 | -6,719 | -33,595 | -47,033 | -87,347 | -235,165 | -329,231 | -436,735 | -611,429 | -1,646,155 | -3,057,145 | -4,280,003 | -21,400,015 |
Here are some more numbers to try:
Try the factor calculator