216243023 has 4 divisors (see below), whose sum is σ = 217675248. Its totient is φ = 214810800.

The previous prime is 216243019. The next prime is 216243031. The reversal of 216243023 is 320342612.

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 216243023 - 2² = 216243019 is a prime.

It is a super-2 number, since 2×216243023² = 93522089992357058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216243023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216243823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715886 + ... + 716187.

It is an arithmetic number, because the mean of its divisors is an integer number (54418812).

Almost surely, 2^216243023 is an apocalyptic number.

216243023 is a deficient number, since it is larger than the sum of its proper divisors (1432225).

216243023 is a wasteful number, since it uses less digits than its factorization.

216243023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432224.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 216243023 is about 14705.2039428224. The cubic root of 216243023 is about 600.2249369580.

Adding to 216243023 its reverse (320342612), we get a palindrome (536585635).

The spelling of 216243023 in words is "two hundred sixteen million, two hundred forty-three thousand, twenty-three".