Divisor 16971

To determine if any number is divisible by 16971, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 5657 - then it is divisible by 16971.

The following tests must pass:

• Test if a number is divisible by 3
• The "Sixten Johansson Test" for Divisibility by 5657

Easy!