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Above a certain number of sides, a polygon is simply called an n-gon, with the letter "n" representing the number of sides. So, in your case, a 25-gon.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
The formula for the sum of the interior angles of a polygon is: 180 * (n - 2) where n is the number of sides of the polygon. So the sum of the angles of a polygon with 25 sides is 180 * 23 = 4,140.
There is not a name for such a polygon. A polygon with one million sides is called a megagon though..
the name of the polygon with 101 sides is hecatontakaihenagon