Divisor 21278

To determine if any number is divisible by 21278, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 2 and 10639 - then it is divisible by 21278.

The following tests must pass:

• Test if a number is divisible by 2
• The "Zach Griffin Test" for Divisibility by 10639

Easy!