321912923 has 4 divisors (see below), whose sum is σ = 322346928. Its totient is φ = 321478920.

The previous prime is 321912919. The next prime is 321912961. The reversal of 321912923 is 329219123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329219123 = 73 ⋅4509851.

It is a cyclic number.

It is not a de Polignac number, because 321912923 - 2² = 321912919 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 321912923.

It is not an unprimeable number, because it can be changed into a prime (321912973) 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, 215888 + ... + 217373.

It is an arithmetic number, because the mean of its divisors is an integer number (80586732).

Almost surely, 2^321912923 is an apocalyptic number.

321912923 is a deficient number, since it is larger than the sum of its proper divisors (434005).

321912923 is an equidigital number, since it uses as much as digits as its factorization.

321912923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434004.

The product of its digits is 5832, while the sum is 32.

The square root of 321912923 is about 17941.9319751246. The cubic root of 321912923 is about 685.3506102905.

The spelling of 321912923 in words is "three hundred twenty-one million, nine hundred twelve thousand, nine hundred twenty-three".