>>14068217e is called the natural exponent because (e^x)' = e^x.
Normally (a^x)' = ln(a)a^x
Let a = e, then ln(e) = 1
Usually these functions are generalized as a*b^cx and so it becomes efficient to rewrite them as A*e^Bx where a,b,c, A, B are arbitrary parameters.
What this means in retard terms is that you can always rewrite 2^x = e^(x*ln(2))
