Azimuthal does not have a specific quantum number; it is the name of the four quantum numbers. The azimuthal quantum number is affiliated with the angular momentum of an atomic electron.
A quantum number depends on the sublevel of an electron; the sublevels are s, p, d and f. The sublevel s has an azimuthal quantum number of zero, while the sublevels p, d and f have the numbers one, two, and three respectively. The next sublevels are in alphabetical order after f, and each is one quantum number larger than the letter before it. The shape of the electron orbital is determined by the azimuthal quantum number. Higher azimuthal quantum numbers mean higher orbital energies.