I watched this, and it's really interesting. From what I remember (and leaving out his astonishing achievements, with which I assume everyone is familiar): Erdos would have no stable residence, instead he would travel the world with all his possessions packed inside a single suitcase. He would 'crash' at the homes of various mathematicians, often unexpectedly. While visiting, he would start banging a spoon to a pan in the middle of the night, to wake up his host mathematicians and insist that they start working on a Math problem. He was very attached to this mother, and her death left him somewhat baffled. He was celibate, and in one interview he says "he likes women, but dislikes what they stand for".