A yottagram is a unit of mass equal to 1024 grams.
The yottagram is the largest supported gram. It has the factor 1024.
A yoctillion is a numerical value equal to 10^24, or 1 followed by 24 zeros. It is part of the short scale numbering system, which is commonly used in the United States and most English-speaking countries. In scientific notation, it is often represented as 1 yottameter or 1 yottagram, depending on the context. The term is derived from the SI prefix "yocto," which signifies a factor of one septillionth (10^-24).
3.5 x 10^23. That's on the surface of the earth, which might be difficult to achieve, since if put there it could well alter what you might call the earth, and therefore what things weigh.