12423311321 has 4 divisors (see below), whose sum is σ = 12428638692. Its totient is φ = 12417983952.

The previous prime is 12423311317. The next prime is 12423311347. The reversal of 12423311321 is 12311332421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12311332421 = 47 ⋅261943243.

It can be written as a sum of positive squares in 2 ways, for example, as 1669621321 + 10753690000 = 40861^2 + 103700^2 .

It is a cyclic number.

It is not a de Polignac number, because 12423311321 - 2² = 12423311317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12423311311) 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, 2660186 + ... + 2664851.

It is an arithmetic number, because the mean of its divisors is an integer number (3107159673).

Almost surely, 2^12423311321 is an apocalyptic number.

It is an amenable number.

12423311321 is a deficient number, since it is larger than the sum of its proper divisors (5327371).

12423311321 is an equidigital number, since it uses as much as digits as its factorization.

12423311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327370.

The product of its digits is 864, while the sum is 23.

Adding to 12423311321 its reverse (12311332421), we get a palindrome (24734643742).

The spelling of 12423311321 in words is "twelve billion, four hundred twenty-three million, three hundred eleven thousand, three hundred twenty-one".