Divisor 28521

To determine if any number is divisible by 28521, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 9 and 3169 - then it is divisible by 28521.

The following tests must pass:

• Test if a number is divisible by 9
• The "Shua The Parua Test" for Divisibility by 3169

Easy!