Divisor 21687

To determine if any number is divisible by 21687, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 7229 - then it is divisible by 21687.

The following tests must pass:

• Test if a number is divisible by 3
• The "Inoa Koala Test" for Divisibility by 7229

Easy!