216516242 has 4 divisors (see below), whose sum is σ = 324774366. Its totient is φ = 108258120.

The previous prime is 216516239. The next prime is 216516259. The reversal of 216516242 is 242615612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 183900721 + 32615521 = 13561^2 + 5711^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54129059 + ... + 54129062.

Almost surely, 2^216516242 is an apocalyptic number.

216516242 is a deficient number, since it is larger than the sum of its proper divisors (108258124).

216516242 is a wasteful number, since it uses less digits than its factorization.

216516242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108258123.

The product of its digits is 5760, while the sum is 29.

The square root of 216516242 is about 14714.4908848387. The cubic root of 216516242 is about 600.4776215471.

The spelling of 216516242 in words is "two hundred sixteen million, five hundred sixteen thousand, two hundred forty-two".