So he's a mathematical genius but at the same time...

... he isn't rich, he isn't exactly happy in his life, he is frequently depressed, he's somewhat at least asocial if not anti-social and it seems like he has no other interests, priorities and important matters to take care of in his life apart from maths?

Besides the fact that he stumbles upon a surreal conspiracy that we later see in this movie.

So being well educated and a mathematical genius does not guarantee a successful and fulfilled life as we see in the movie and apparently, he's not even well paid for it, lives alone in very small and unspectacular apartment, possibly struggles with paying the flat fees etc.

Yeah, haha, no wonder I myself wasn't too keen on maths at school etc when I was young, lol.