216530344 has 8 divisors (see below), whose sum is σ = 405994410. Its totient is φ = 108265168.

The previous prime is 216530339. The next prime is 216530351. The reversal of 216530344 is 443035612.

216530344 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 117288900 + 99241444 = 10830^2 + 9962^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13533139 + ... + 13533154.

Almost surely, 2^216530344 is an apocalyptic number.

It is an amenable number.

216530344 is a deficient number, since it is larger than the sum of its proper divisors (189464066).

216530344 is a wasteful number, since it uses less digits than its factorization.

216530344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27066299 (or 27066295 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 216530344 is about 14714.9700645295. The cubic root of 216530344 is about 600.4906579079.

Adding to 216530344 its reverse (443035612), we get a palindrome (659565956).

The spelling of 216530344 in words is "two hundred sixteen million, five hundred thirty thousand, three hundred forty-four".