Divisor 21123

To determine if any number is divisible by 21123, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 9 and 2347 - then it is divisible by 21123.

The following tests must pass:

• Test if a number is divisible by 9
• The "Akin Budi Test" for Divisibility by 2347

Easy!