216513330 has 64 divisors (see below), whose sum is σ = 568425600. Its totient is φ = 52344320.

The previous prime is 216513287. The next prime is 216513359. The reversal of 216513330 is 33315612.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216513330.

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 31 ways as a sum of consecutive naturals, for example, 167326 + ... + 168614.

It is an arithmetic number, because the mean of its divisors is an integer number (8881650).

Almost surely, 2^216513330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216513330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284212800).

216513330 is an abundant number, since it is smaller than the sum of its proper divisors (351912270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216513330 is a wasteful number, since it uses less digits than its factorization.

216513330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 216513330 is about 14714.3919344294. The cubic root of 216513330 is about 600.4749295263.

Adding to 216513330 its reverse (33315612), we get a palindrome (249828942).

The spelling of 216513330 in words is "two hundred sixteen million, five hundred thirteen thousand, three hundred thirty".