Divisor 21159

To determine if any number is divisible by 21159, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 9 and 2351 - then it is divisible by 21159.

The following tests must pass:

• Test if a number is divisible by 9
• The "pirate-numbers Test" for Divisibility by 2351

Easy!