... some have said he was ENTP. I don't know about that.
People explained his problem solving method as such. He wouldn't worry so much about the math behind it, but would try and tie the question to a real life problem. If the question did not make sense, he would often find out that it didn't line up with reality, and claim that the equation or whatever was wrong... he won the Noble Prize...
This doesn't really sound Ti to me. It sounds like Te (well, this, plus he was said to be competative, that doesn't really sound like ENTp).
Me thinks ENTj.