216949924 has 12 divisors (see below), whose sum is σ = 379814400. Its totient is φ = 108431528.

The previous prime is 216949913. The next prime is 216949927. The reversal of 216949924 is 429949612.

It is a happy number.

216949924 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216949927) 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, 2097 + ... + 20935.

It is an arithmetic number, because the mean of its divisors is an integer number (31651200).

Almost surely, 2^216949924 is an apocalyptic number.

It is an amenable number.

216949924 is a deficient number, since it is larger than the sum of its proper divisors (162864476).

216949924 is a wasteful number, since it uses less digits than its factorization.

216949924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21722 (or 21720 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The square root of 216949924 is about 14729.2200743963. The cubic root of 216949924 is about 600.8782730261.

The spelling of 216949924 in words is "two hundred sixteen million, nine hundred forty-nine thousand, nine hundred twenty-four".