How many zeros in 10 million trillion trillion trillionths?

Answer 1

It would take several thousand years to count that many zeros.

Not really.

1 millionth = 10-6

1 trillionth = 10-12

10 million trillion trillion trillionths = 10*10-6*10-12*10-12*10-12=10*10-42 = 10-41

You would have a decimal point, then 40 zeroes, then a one. ■