216323 has 4 divisors (see below), whose sum is σ = 218040. Its totient is φ = 214608.

The previous prime is 216319. The next prime is 216329. The reversal of 216323 is 323612.

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 216323 - 2² = 216319 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216329) 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, 653 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (54510).

2²¹⁶³²³ is an apocalyptic number.

216323 is a deficient number, since it is larger than the sum of its proper divisors (1717).

216323 is a wasteful number, since it uses less digits than its factorization.

216323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716.

The product of its digits is 216, while the sum is 17.

The square root of 216323 is about 465.1053644068. The cubic root of 216323 is about 60.0298925122.

Adding to 216323 its reverse (323612), we get a palindrome (539935).

The spelling of 216323 in words is "two hundred sixteen thousand, three hundred twenty-three".