216433323 has 8 divisors (see below), whose sum is σ = 320642000. Its totient is φ = 144288864.

The previous prime is 216433309. The next prime is 216433331. The reversal of 216433323 is 323334612.

It is a happy number.

216433323 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 216433323 - 2⁸ = 216433067 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8016049 = 216433323 / (2 + 1 + 6 + 4 + 3 + 3 + 3 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216433303) 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, 4007998 + ... + 4008051.

It is an arithmetic number, because the mean of its divisors is an integer number (40080250).

Almost surely, 2^216433323 is an apocalyptic number.

216433323 is a deficient number, since it is larger than the sum of its proper divisors (104208677).

216433323 is an equidigital number, since it uses as much as digits as its factorization.

216433323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8016058 (or 8016052 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

The square root of 216433323 is about 14711.6730183892. The cubic root of 216433323 is about 600.4009569961.

Adding to 216433323 its reverse (323334612), we get a palindrome (539767935).

The spelling of 216433323 in words is "two hundred sixteen million, four hundred thirty-three thousand, three hundred twenty-three".