12918082321 has 4 divisors (see below), whose sum is σ = 12919166500. Its totient is φ = 12916998144.

The previous prime is 12918082279. The next prime is 12918082327. The reversal of 12918082321 is 12328081921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10464267025 + 2453815296 = 102295^2 + 49536^2 .

It is a cyclic number.

It is not a de Polignac number, because 12918082321 - 2⁷ = 12918082193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12918082327) 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, 524016 + ... + 548113.

It is an arithmetic number, because the mean of its divisors is an integer number (3229791625).

Almost surely, 2^12918082321 is an apocalyptic number.

It is an amenable number.

12918082321 is a deficient number, since it is larger than the sum of its proper divisors (1084179).

12918082321 is a wasteful number, since it uses less digits than its factorization.

12918082321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084178.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 12918082321 in words is "twelve billion, nine hundred eighteen million, eighty-two thousand, three hundred twenty-one".