323440021 has 16 divisors (see below), whose sum is σ = 354029760. Its totient is φ = 294433920.

The previous prime is 323440009. The next prime is 323440043. The reversal of 323440021 is 120044323.

It is a cyclic number.

It is not a de Polignac number, because 323440021 - 2⁵ = 323439989 is a prime.

It is a super-3 number, since 3×323440021³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323440321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49095 + ... + 55291.

It is an arithmetic number, because the mean of its divisors is an integer number (22126860).

Almost surely, 2^323440021 is an apocalyptic number.

It is an amenable number.

323440021 is a deficient number, since it is larger than the sum of its proper divisors (30589739).

323440021 is a wasteful number, since it uses less digits than its factorization.

323440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324.

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

The square root of 323440021 is about 17984.4383009312. The cubic root of 323440021 is about 686.4326285026.

Adding to 323440021 its reverse (120044323), we get a palindrome (443484344).

The spelling of 323440021 in words is "three hundred twenty-three million, four hundred forty thousand, twenty-one".