Compounded n times per year:

    total = initial * ( 1 + rate / n ) n * time
$.01 compounded annually for 2000 years at 3% = $473 hexillion
compounded quarterly (n=4) = $913 hexillion
compounded monthly (n=12) = $1060 hexillion

Compounded continuously:

    total = initial * e rate * time
$.01 compounded continuously for 2000 years at 3% = $1142 hexillion

Where rate is in decimal. (ie 9% = .09)