323140021 has 4 divisors (see below), whose sum is σ = 323233792. Its totient is φ = 323046252.

The previous prime is 323140009. The next prime is 323140033. The reversal of 323140021 is 120041323.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120041323 = 83 ⋅1446281.

It is an interprime number because it is at equal distance from previous prime (323140009) and next prime (323140033).

It is a cyclic number.

It is not a de Polignac number, because 323140021 - 2⁵ = 323139989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 323139977 and 323140004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323140921) 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, 41511 + ... + 48676.

It is an arithmetic number, because the mean of its divisors is an integer number (80808448).

Almost surely, 2^323140021 is an apocalyptic number.

It is an amenable number.

323140021 is a deficient number, since it is larger than the sum of its proper divisors (93771).

323140021 is an equidigital number, since it uses as much as digits as its factorization.

323140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93770.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 323140021 is about 17976.0958219520. The cubic root of 323140021 is about 686.2203341290.

Adding to 323140021 its reverse (120041323), we get a palindrome (443181344).

The spelling of 323140021 in words is "three hundred twenty-three million, one hundred forty thousand, twenty-one".