216306233 has 16 divisors (see below), whose sum is σ = 255225600. Its totient is φ = 180727680.

The previous prime is 216306229. The next prime is 216306247. The reversal of 216306233 is 332603612.

It is a cyclic number.

It is not a de Polignac number, because 216306233 - 2² = 216306229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216306263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31013 + ... + 37341.

It is an arithmetic number, because the mean of its divisors is an integer number (15951600).

Almost surely, 2^216306233 is an apocalyptic number.

It is an amenable number.

216306233 is a deficient number, since it is larger than the sum of its proper divisors (38919367).

216306233 is a wasteful number, since it uses less digits than its factorization.

216306233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6592.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 216306233 is about 14707.3530249328. The cubic root of 216306233 is about 600.2834151794.

Adding to 216306233 its reverse (332603612), we get a palindrome (548909845).

The spelling of 216306233 in words is "two hundred sixteen million, three hundred six thousand, two hundred thirty-three".