Divisor 21913

To determine if any number is divisible by 21913, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 17 and 1289 - then it is divisible by 21913.

The following tests must pass:

• Test if a number is divisible by 17
• The "Rick Schrijver Test" for Divisibility by 1289

Easy!