321320233 has 4 divisors (see below), whose sum is σ = 346037188. Its totient is φ = 296603280.

The previous prime is 321320221. The next prime is 321320269. The reversal of 321320233 is 332023123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154057744 + 167262489 = 12412^2 + 12933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321320233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321320233.

It is not an unprimeable number, because it can be changed into a prime (321324233) 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, 12358458 + ... + 12358483.

It is an arithmetic number, because the mean of its divisors is an integer number (86509297).

Almost surely, 2^321320233 is an apocalyptic number.

It is an amenable number.

321320233 is a deficient number, since it is larger than the sum of its proper divisors (24716955).

321320233 is a wasteful number, since it uses less digits than its factorization.

321320233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24716954.

The product of its (nonzero) digits is 648, while the sum is 19.

The square root of 321320233 is about 17925.4074709614. The cubic root of 321320233 is about 684.9297407826.

Adding to 321320233 its reverse (332023123), we get a palindrome (653343356).

The spelling of 321320233 in words is "three hundred twenty-one million, three hundred twenty thousand, two hundred thirty-three".