Divisor 21578

To determine if any number is divisible by 21578, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 2 and 10789 - then it is divisible by 21578.

The following tests must pass:

• Test if a number is divisible by 2
• The "Dan Smith Test" for Divisibility by 10789

Easy!