Divisor 18421

To determine if any number is divisible by 18421, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 169 and 109 - then it is divisible by 18421.

The following tests must pass:

• Test if a number is divisible by 169
• Test if a number is divisible by 109

Easy!