216304111 has 4 divisors (see below), whose sum is σ = 216540400. Its totient is φ = 216067824.

The previous prime is 216304103. The next prime is 216304117. The reversal of 216304111 is 111403612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216304111 - 2³ = 216304103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216304117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116766 + ... + 118603.

It is an arithmetic number, because the mean of its divisors is an integer number (54135100).

Almost surely, 2^216304111 is an apocalyptic number.

216304111 is a deficient number, since it is larger than the sum of its proper divisors (236289).

216304111 is an equidigital number, since it uses as much as digits as its factorization.

216304111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236288.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 216304111 is about 14707.2808839704. The cubic root of 216304111 is about 600.2814522130.

Adding to 216304111 its reverse (111403612), we get a palindrome (327707723).

The spelling of 216304111 in words is "two hundred sixteen million, three hundred four thousand, one hundred eleven".