[relate]

Would you prefer 11111+11111+33333 instead?

[rejschaap]

Still a bit boring, feels like cheating, something like 12321 + X + Y would be nice.

[ashtonbaker]

55555 = 12321 + 43234 + 0

:)

And if you don't like that:

55555 = 12321 + 23132 + 20102

Palindromes are sort of the least surprising numbers to have this property because you can easily "split" them into as many palindromes as you want like this. The surprising result is that you could write something like 19837100018374 as the sum of only 3 palindromes.

[kosievdmerwe]

More surprising is that you can do it in any base >= 5