Question

How many eukaryotic cells in the human body?

Answer 1

there are approx \[10^{13}\] cells in a 70 kg adult.

Answer 2

and for every cell in the human body come >10 prokaryotic cells of all the little midgets and parasites that colonize us. this is why the question is legit as it is. :-) yep, 100 trillion cells is about right, as viendra said.