216312243 has 8 divisors (see below), whose sum is σ = 329618688. Its totient is φ = 123606984.

The previous prime is 216312227. The next prime is 216312253. The reversal of 216312243 is 342213612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216312243 - 2⁴ = 216312227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216312223) 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, 5150271 + ... + 5150312.

It is an arithmetic number, because the mean of its divisors is an integer number (41202336).

Almost surely, 2^216312243 is an apocalyptic number.

216312243 is a deficient number, since it is larger than the sum of its proper divisors (113306445).

216312243 is a wasteful number, since it uses less digits than its factorization.

216312243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10300593.

The product of its digits is 1728, while the sum is 24.

The square root of 216312243 is about 14707.5573430805. The cubic root of 216312243 is about 600.2889746893.

Adding to 216312243 its reverse (342213612), we get a palindrome (558525855).

The spelling of 216312243 in words is "two hundred sixteen million, three hundred twelve thousand, two hundred forty-three".