Wow! What a question. I have no idea to be host. But when you think that there are over 37 trillion cells in our bodies and there are nearly 8 billion people already on the planet, that is already a number with A LOT of zeros. 23 zeros in fact!
Scientists have also estimated that there are 100 trillion atoms in each cell. So it’s 100 trillion x 37 trillion x 8 billion and that is just the number of atoms in the humans on the planet, let alone anything else.
My very rough estimate for the number of atoms just in the humans on the planet is 2,960,000,000,000,000,000,000,000,000,000,000,000,000. I don’t even know what that number is!
For a person of 70kg, there are approximately 7 * 10^27 atoms (that is like 7,000,000,000,000,000,000,000,000,000 atoms). If you multiply that number by the number of the world’s population (7 billions, give or take), you’d get to 49 * 10^36 atoms (so 49,000,000,000,000,000,000,000,000,000,000,000,000) for the entire population, but obviously this is a broad approximation because there are so many variables!
Tough question! The simple answer is I have absolutely no idea – other than to say it will no doubt involve a lot of zeros! I’m sure someone who is better on the physics side of things will be able to help out with that one!