Divisor 21055

To determine if any number is divisible by 21055, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 5 and 4211 - then it is divisible by 21055.

The following tests must pass:

• Test if a number is divisible by 5
• The "Tommy Thorn Test" for Divisibility by 4211

Easy!