12321545431 has 4 divisors (see below), whose sum is σ = 13269356632. Its totient is φ = 11373734232.

The previous prime is 12321545407. The next prime is 12321545437. The reversal of 12321545431 is 13454512321.

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

It is a cyclic number.

It is not a de Polignac number, because 12321545431 - 2²¹ = 12319448279 is a prime.

It is a super-2 number, since 2×12321545431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12321545393 and 12321545402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321545437) 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 3 ways as a sum of consecutive naturals, for example, 473905581 + ... + 473905606.

It is an arithmetic number, because the mean of its divisors is an integer number (3317339158).

Almost surely, 2^12321545431 is an apocalyptic number.

12321545431 is a deficient number, since it is larger than the sum of its proper divisors (947811201).

12321545431 is an equidigital number, since it uses as much as digits as its factorization.

12321545431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947811200.

The product of its digits is 14400, while the sum is 31.

The spelling of 12321545431 in words is "twelve billion, three hundred twenty-one million, five hundred forty-five thousand, four hundred thirty-one".