Identify the MOST SPECIFIC set to which each of the following numbers belongs.
47
144
-9
0.121212...
0
Rational number
Integer
Natural number
Whole number
Irrational number
47: Natural number, Integer, Rational number
144: Natural number, Integer, Rational number
-9: Integer, Rational number
0.121212...: Irrational number
0: Whole number, Integer, Rational number