216326433 has 4 divisors (see below), whose sum is σ = 288435248. Its totient is φ = 144217620.

The previous prime is 216326389. The next prime is 216326437. The reversal of 216326433 is 334623612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-216326433 is a prime.

It is a super-2 number, since 2×216326433² = 93594251229006978, which contains 22 as substring.

It is a Duffinian 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 216326433.

It is not an unprimeable number, because it can be changed into a prime (216326437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36054403 + ... + 36054408.

It is an arithmetic number, because the mean of its divisors is an integer number (72108812).

Almost surely, 2^216326433 is an apocalyptic number.

It is an amenable number.

216326433 is a deficient number, since it is larger than the sum of its proper divisors (72108815).

216326433 is an equidigital number, since it uses as much as digits as its factorization.

216326433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72108814.

The product of its digits is 15552, while the sum is 30.

The square root of 216326433 is about 14708.0397402237. The cubic root of 216326433 is about 600.3021006443.

The spelling of 216326433 in words is "two hundred sixteen million, three hundred twenty-six thousand, four hundred thirty-three".