The exact number is 2097152 GH = 2 PH.
There is no exact number, just estimates.
I am saying that 2 PH equals to exactly 2097152 GH, for those interested to capture exact moment.
It does not.
2 PH = 2000 TH = 2000000 GH = 2000000000 MH = etc... You get the idea.
Lets not propagate the sillyness of the computer-storage world where standard metric quantities are mutilated to the nearest power of 2. It's all neat powers of 10 in the SI unit system, like it's supposed to be.
The convention is to use capital letter to represent base-2 and small letter to represent base-10.
So, k is 10^3 and K is 2^10, etc.
If you want to use SI unit system then start writing it down as gH, tH, pH, etc.
If you don't like that "sillyness" because you have to use base-2 instead of base-10, go ahead and design your own computer that operates in base-10
