Divisor 21104

To determine if any number is divisible by 21104, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 16 and 1319 - then it is divisible by 21104.

The following tests must pass:

• Test if a number is divisible by 16
• The "Geza Kerecsenyi Test" for Divisibility by 1319

Easy!