How big is 1 trillion?

10 bytes. Or if you prefer 80 bits. Or 60 q-tits perhaps (see the note here here ) but I am not sure how computing will work in the future.

If you are more of a visual learner do the following, take a copper penny (not the current zinc ones). Now go and get 999,999,999,999 more, and you will have 1 trillion pennies. If this won't work for you take the same copper penny and cut it in half. Take one half and cut it in half again. Continue repeating those steps until the penny has been halved 49 times. Make sure you are accurate with your cutting or this will not work correctly.

That fragment of the penny you have left contains approximately 1 trillion copper atoms.

So, there you have it. 1 trillion in like five different ways, all with one click of the mouse.