Divisor 12981

To determine if any number is divisible by 12981, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 4327 - then it is divisible by 12981.

The following tests must pass:

• Test if a number is divisible by 3
• The "Alexander Sheldon Test" for Divisibility by 4327

Easy!