Divisor 21985

To determine if any number is divisible by 21985, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 5 and 4397 - then it is divisible by 21985.

The following tests must pass:

• Test if a number is divisible by 5
• The "Adeoxymus Test" for Divisibility by 4397

Easy!