Divisor 21439

To determine if any number is divisible by 21439, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 11 and 1949 - then it is divisible by 21439.

The following tests must pass:

• Test if a number is divisible by 11
• The "Jachym Tolar Test" for Divisibility by 1949

Easy!