Divisor 21337

To determine if any number is divisible by 21337, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 19 and 1123 - then it is divisible by 21337.

The following tests must pass:

• Test if a number is divisible by 19
• The "Liquid Void Test" for Divisibility by 1123

Easy!