Divisor 21955

To determine if any number is divisible by 21955, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 5 and 4391 - then it is divisible by 21955.

The following tests must pass:

• Test if a number is divisible by 5
• The "Aleix Ruiz de Villa Test" for Divisibility by 4391

Easy!