321309899 has 4 divisors (see below), whose sum is σ = 321701136. Its totient is φ = 320918664.

The previous prime is 321309883. The next prime is 321309917. The reversal of 321309899 is 998903123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998903123 = 419 ⋅2384017.

It is a cyclic number.

It is not a de Polignac number, because 321309899 - 2⁴ = 321309883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321302899) 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, 194384 + ... + 196029.

It is an arithmetic number, because the mean of its divisors is an integer number (80425284).

Almost surely, 2^321309899 is an apocalyptic number.

321309899 is a deficient number, since it is larger than the sum of its proper divisors (391237).

321309899 is an equidigital number, since it uses as much as digits as its factorization.

321309899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391236.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 321309899 is about 17925.1192185715. The cubic root of 321309899 is about 684.9223980145.

The spelling of 321309899 in words is "three hundred twenty-one million, three hundred nine thousand, eight hundred ninety-nine".