321440023 has 4 divisors (see below), whose sum is σ = 331809088. Its totient is φ = 311070960.

The previous prime is 321439999. The next prime is 321440051. The reversal of 321440023 is 320044123.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321440023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (301440023) 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 3 ways as a sum of consecutive naturals, for example, 5184486 + ... + 5184547.

It is an arithmetic number, because the mean of its divisors is an integer number (82952272).

Almost surely, 2^321440023 is an apocalyptic number.

321440023 is a deficient number, since it is larger than the sum of its proper divisors (10369065).

321440023 is a wasteful number, since it uses less digits than its factorization.

321440023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10369064.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 321440023 is about 17928.7485062399. The cubic root of 321440023 is about 685.0148454346.

Adding to 321440023 its reverse (320044123), we get a palindrome (641484146).

The spelling of 321440023 in words is "three hundred twenty-one million, four hundred forty thousand, twenty-three".