I am nt sure that such a number exists. Yocto is a prefix for 10-24 ie a septillionth. So the question seems to be asking for the number of 0s in a septillionthillion!
how many zeros in one billion
Seven zeros.
33 zeros
there are 21 zeros
12 zeros.12 zeros.12 zeros.12 zeros.
Six zeros: 127,000,000
how many zeros in 12 lakh
10 zeros
101 zeros.
11 zeros
There are 100 zeros in googol
9 zeros