they probably thought it was pass by reference not by value

Because math.

Next bigger number after 2017 is 2071, and then 2107.

why the next bigger number after 2017 is not 2107

Fixed in Java, already correct in Python.

Fixed.

Approved now, thanks.

Java/PHP fixes not approved yet:
https://www.codewars.com/kumite/57fa3ef67a28dbd342000028?sel=5f01ee17233ac30011a37bf2
https://www.codewars.com/kumite/5eb0593c9a4f1f000f52ccf2?sel=5f01f145f7d0a7002a79405e

Duplicate

No random tests

Sorting a number's digits is not a good task.

ohhh i get it now thanks for the help

But 2071 is next bigger number after 2017?

The test are ok, and it's been discussed before, it's NEXT bigger number, not biggest number.

i didn't start this kata because i think that tests are incorrect. for exaple one of them gives you 2017 and expects 2071 but 7210 is bigger then 2071