Divisor 21215

To determine if any number is divisible by 21215, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 5 and 4243 - then it is divisible by 21215.

The following tests must pass:

• Test if a number is divisible by 5
• The "Alex Niblett Test" for Divisibility by 4243

Easy!