I know many mathematicians. Not a single one of them I'd refer to as "genius". Most are very bright. Some think fast.

But for the most of it, they've "just" persistently and wholeheartedly studied their field in mathematics.

Geniuses are rare. Art Tatum, Messi, Tesla, Mingus - those are people you'll have to wait another century to see the equal of. If at all.