216722530 has 16 divisors (see below), whose sum is σ = 395596224. Its totient is φ = 85467760.

The previous prime is 216722521. The next prime is 216722533. The reversal of 216722530 is 35227612.

216722530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216722533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151912 + ... + 153331.

It is an arithmetic number, because the mean of its divisors is an integer number (24724764).

Almost surely, 2^216722530 is an apocalyptic number.

216722530 is a deficient number, since it is larger than the sum of its proper divisors (178873694).

216722530 is a wasteful number, since it uses less digits than its factorization.

216722530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305321.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 216722530 is about 14721.4989046632. The cubic root of 216722530 is about 600.6682646868.

The spelling of 216722530 in words is "two hundred sixteen million, seven hundred twenty-two thousand, five hundred thirty".