there are loads of tires out there but you will want something with faster rolling tire profile something like these
https://smile.amazon.com/Kenda-Small...8-3&th=1&psc=1
you probably can fit a 2.1 tire on it. if you try putting a 2.2 on it you might start getting rubbing on the front derailleur cage when in the lowest sprocket. look for something in the XC category of tires not slicks though.