Divisor 21451

To determine if any number is divisible by 21451, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 19 and 1129 - then it is divisible by 21451.

The following tests must pass:

• Test if a number is divisible by 19
• The "Roy Van Rossum Test" for Divisibility by 1129

Easy!