He is a stage performer. That class of people is highly intelligent. I really like Michael Clingman's comment. He is an idot-savant. Really dumb in some areas, really sharp in other. People judge him by his numeracal literacy etc, but thats obviously the wrong axis to judge him. Alexei brings good points. One should look at his humor and stage performance to look at the underlying intelligence. Being petty and vengeanful, does take some points off intelligence, but I wouldnt give it too much weight. Many smart people are highly vengeanful and credit hungry. (think the great physicist of classical times and the inventor of calculus). Recognition and thirst for it is also a hallmark. But they are able to in general, hide the very stark manifestations of that desire. This however could have to do with age. Trump was also probably not as readable (in his jealousy and vengeance) when he was young. That points to signs of moderate intelligence in total, accentuated remarkably by tides of inordinate wealth and the right time and place.