12321544431 has 8 divisors (see below), whose sum is σ = 18775686784. Its totient is φ = 7040882520.

The previous prime is 12321544423. The next prime is 12321544453. The reversal of 12321544431 is 13444512321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12321544431 - 2³ = 12321544423 is a prime.

It is a super-2 number, since 2×12321544431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321544471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293370085 + ... + 293370126.

It is an arithmetic number, because the mean of its divisors is an integer number (2346960848).

Almost surely, 2^12321544431 is an apocalyptic number.

12321544431 is a deficient number, since it is larger than the sum of its proper divisors (6454142353).

12321544431 is an equidigital number, since it uses as much as digits as its factorization.

12321544431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586740221.

The product of its digits is 11520, while the sum is 30.

The spelling of 12321544431 in words is "twelve billion, three hundred twenty-one million, five hundred forty-four thousand, four hundred thirty-one".