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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It's not a reversed number, it's a number with its digits rearranged.
Maybe 1210 instead of 1021, send the 0s to the end perhaps. If I understood correctly, the reversed number should be the largest possible...?
No, it's the other way around, and you can convert one into the other, why do you say you can't?