Divisor 21711

To determine if any number is divisible by 21711, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 7237 - then it is divisible by 21711.

The following tests must pass:

• Test if a number is divisible by 3
• The "Sergio Livi Test" for Divisibility by 7237

Easy!