WTF

A joist hole can be no more than 1/3rd the total depth of the joist, I think that pipe is larger than that. Even if you placed it in the very middle you’d still be compromising the structural integrity.

Best to just get some hangers and a fix it to the bottom; you’re still well clear of the ground. Put in some shims near one end if it’s a drain and you have to maintain pitch; I think this is a thick electrical conduit though?

EDIT: nope that looks like 4” PVC drain pipe