321973139 has 4 divisors (see below), whose sum is σ = 322097424. Its totient is φ = 321848856.

The previous prime is 321973063. The next prime is 321973151. The reversal of 321973139 is 931379123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931379123 = 53 ⋅17573191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321973139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321973199) 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, 58172 + ... + 63465.

It is an arithmetic number, because the mean of its divisors is an integer number (80524356).

Almost surely, 2^321973139 is an apocalyptic number.

321973139 is a deficient number, since it is larger than the sum of its proper divisors (124285).

321973139 is a wasteful number, since it uses less digits than its factorization.

321973139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124284.

The product of its digits is 30618, while the sum is 38.

The square root of 321973139 is about 17943.6099768135. The cubic root of 321973139 is about 685.3933407894.

The spelling of 321973139 in words is "three hundred twenty-one million, nine hundred seventy-three thousand, one hundred thirty-nine".