12321023423 has 4 divisors (see below), whose sum is σ = 12969498360. Its totient is φ = 11672548488.

The previous prime is 12321023419. The next prime is 12321023437. The reversal of 12321023423 is 32432012321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32432012321 = 22481 ⋅1442641.

It is a cyclic number.

It is not a de Polignac number, because 12321023423 - 2² = 12321023419 is a prime.

It is a super-2 number, since 2×12321023423² (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 (12321023413) 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, 324237440 + ... + 324237477.

It is an arithmetic number, because the mean of its divisors is an integer number (3242374590).

Almost surely, 2^12321023423 is an apocalyptic number.

12321023423 is a deficient number, since it is larger than the sum of its proper divisors (648474937).

12321023423 is an equidigital number, since it uses as much as digits as its factorization.

12321023423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648474936.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 12321023423 its reverse (32432012321), we get a palindrome (44753035744).

The spelling of 12321023423 in words is "twelve billion, three hundred twenty-one million, twenty-three thousand, four hundred twenty-three".