Divisor 21561

To determine if any number is divisible by 21561, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 7187 - then it is divisible by 21561.

The following tests must pass:

• Test if a number is divisible by 3
• The "Jim Loy Test" for Divisibility by 7187

Easy!