Question: how many electrons are there in the universe?
Answer: The current estimate is that there are 100000000000000000000000000000000000000000000000000000000000000000000000000000000 (that's 1 followed by 80 zeros!) atoms in the universe. Most atoms in the universe are hydrogen, so have 1 proton and 1 electron, so the number of electrons in the universe is probably similar.