Divisor 21823

To determine if any number is divisible by 21823, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 139 and 157 - then it is divisible by 21823.

The following tests must pass:

• Test if a number is divisible by 139
• Test if a number is divisible by 157

Easy!