Your question might need to be constructed more carefully in order to cleanly disentangle spatial visualization from math ability. I have noticed that I seem to be best at math that I can somehow analogize to geometry or to tangible physics. Introspectively this feels rather like using what the article calls "spatial intuition" to solve math problems. I don't know how much to trust my introspection, but if it's correct, then given the way you constructed your question, the two kinds of abilities end up mixed. Perhaps you could somehow narrow "mathematical intelligence" to something specific to fields of math (such as number theory, graph theory, combinatorics, and abstract algebra, in my experience) where geometrical and physical analogies are seldom helpful.