* A number with 24 zeros after the decimal point: This would be a very, very small number, like 0.0000000000000000000000000001.
* A number with 24 zeros in its decimal representation: This would be a number like 1000000000000000000000000000, which is a 1 followed by 24 zeros.
* A number with 24 zeros in its scientific notation: This would be a number like 1 x 10^24.
To be more precise, please clarify what you mean by "has 24 zeros"!
