216504023 has 2 divisors, whose sum is σ = 216504024. Its totient is φ = 216504022.

The previous prime is 216504019. The next prime is 216504047. The reversal of 216504023 is 320405612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216504023 - 2² = 216504019 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216504023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216504073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108252011 + 108252012.

It is an arithmetic number, because the mean of its divisors is an integer number (108252012).

Almost surely, 2^216504023 is an apocalyptic number.

216504023 is a deficient number, since it is larger than the sum of its proper divisors (1).

216504023 is an equidigital number, since it uses as much as digits as its factorization.

216504023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 216504023 is about 14714.0756760321. The cubic root of 216504023 is about 600.4663254367.

Adding to 216504023 its reverse (320405612), we get a palindrome (536909635).

The spelling of 216504023 in words is "two hundred sixteen million, five hundred four thousand, twenty-three".