216424215 has 24 divisors (see below), whose sum is σ = 428726688. Its totient is φ = 98936640.

The previous prime is 216424189. The next prime is 216424249. The reversal of 216424215 is 512424612.

216424215 is a `hidden beast` number, since 2 + 1 + 642 + 4 + 2 + 15 = 666.

It is not a de Polignac number, because 216424215 - 2²⁵ = 182869783 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 343216 + ... + 343845.

It is an arithmetic number, because the mean of its divisors is an integer number (17863612).

Almost surely, 2^216424215 is an apocalyptic number.

216424215 is a deficient number, since it is larger than the sum of its proper divisors (212302473).

216424215 is a wasteful number, since it uses less digits than its factorization.

216424215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687079 (or 687076 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 216424215 is about 14711.3634650225. The cubic root of 216424215 is about 600.3925348047.

Adding to 216424215 its reverse (512424612), we get a palindrome (728848827).

The spelling of 216424215 in words is "two hundred sixteen million, four hundred twenty-four thousand, two hundred fifteen".