Divisor 12199

To determine if any number is divisible by 12199, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 11 and 1109 - then it is divisible by 12199.

The following tests must pass:

• Test if a number is divisible by 11
• The "Gyrdon Test" for Divisibility by 1109

Easy!