Divisor 21129

To determine if any number is divisible by 21129, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 7043 - then it is divisible by 21129.

The following tests must pass:

• Test if a number is divisible by 3
• The "Hakan Brewitz Test" for Divisibility by 7043

Easy!