216304331 has 8 divisors (see below), whose sum is σ = 222450480. Its totient is φ = 210174048.

The previous prime is 216304313. The next prime is 216304339. The reversal of 216304331 is 133403612.

216304331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216304331 is a prime.

It is a super-2 number, since 2×216304331² = 93575127218715122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216304297 and 216304306.

It is not an unprimeable number, because it can be changed into a prime (216304339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27065 + ... + 34133.

It is an arithmetic number, because the mean of its divisors is an integer number (27806310).

Almost surely, 2^216304331 is an apocalyptic number.

216304331 is a deficient number, since it is larger than the sum of its proper divisors (6146149).

216304331 is an equidigital number, since it uses as much as digits as its factorization.

216304331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7933.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 216304331 is about 14707.2883632572. The cubic root of 216304331 is about 600.2816557257.

Adding to 216304331 its reverse (133403612), we get a palindrome (349707943).

The spelling of 216304331 in words is "two hundred sixteen million, three hundred four thousand, three hundred thirty-one".