Divisor 21212

To determine if any number is divisible by 21212, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 4 and 5303 - then it is divisible by 21212.

The following tests must pass:

• Test if a number is divisible by 4
• The "Giorgio Bettineschi Test" for Divisibility by 5303

Easy!