A:
Positive:
1 x 211530355 x 423060729 x 729415113 x 187195145 x 145883565 x 374391291 x 163853277 x 6455
Negative:
-1 x -21153035-5 x -4230607-29 x -729415-113 x -187195-145 x -145883-565 x -37439-1291 x -16385-3277 x -6455
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 21,153,035, 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 | 21,153,035 | |
| -1 | -21,153,035 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,153,035.
Example:
1 x 21,153,035 = 21,153,035
and
-1 x -21,153,035 = 21,153,035
Notice both answers equal 21,153,035
With that explanation out of the way, let's continue. Next, we take the number 21,153,035 and divide it by 2:
21,153,035 ÷ 2 = 10,576,517.5
If the quotient is a whole number, then 2 and 10,576,517.5 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 | 21,153,035 | |
| -1 | -21,153,035 |
Now, we try dividing 21,153,035 by 3:
21,153,035 ÷ 3 = 7,051,011.6667
If the quotient is a whole number, then 3 and 7,051,011.6667 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 | 21,153,035 | |
| -1 | -21,153,035 |
Let's try dividing by 4:
21,153,035 ÷ 4 = 5,288,258.75
If the quotient is a whole number, then 4 and 5,288,258.75 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 | 21,153,035 | |
| -1 | 21,153,035 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 113 | 145 | 565 | 1,291 | 3,277 | 6,455 | 16,385 | 37,439 | 145,883 | 187,195 | 729,415 | 4,230,607 | 21,153,035 |
| -1 | -5 | -29 | -113 | -145 | -565 | -1,291 | -3,277 | -6,455 | -16,385 | -37,439 | -145,883 | -187,195 | -729,415 | -4,230,607 | -21,153,035 |
Here are some more numbers to try:
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