216304911 has 20 divisors (see below), whose sum is σ = 340131000. Its totient is φ = 136612656.

The previous prime is 216304901. The next prime is 216304931. The reversal of 216304911 is 119403612.

216304911 is a `hidden beast` number, since 21 + 630 + 4 + 9 + 1 + 1 = 666.

216304911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216304911 - 2¹⁵ = 216272143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216304901) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 68736 + ... + 71813.

It is an arithmetic number, because the mean of its divisors is an integer number (17006550).

Almost surely, 2^216304911 is an apocalyptic number.

216304911 is a deficient number, since it is larger than the sum of its proper divisors (123826089).

216304911 is a wasteful number, since it uses less digits than its factorization.

216304911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140580 (or 140571 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 216304911 is about 14707.3080813587. The cubic root of 216304911 is about 600.2821922584.

The spelling of 216304911 in words is "two hundred sixteen million, three hundred four thousand, nine hundred eleven".