12403310321 has 4 divisors (see below), whose sum is σ = 12416662500. Its totient is φ = 12389958144.

The previous prime is 12403310299. The next prime is 12403310323. The reversal of 12403310321 is 12301330421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12301330421 = 137 ⋅89790733.

It can be written as a sum of positive squares in 2 ways, for example, as 5256975025 + 7146335296 = 72505^2 + 84536^2 .

It is a cyclic number.

It is not a de Polignac number, because 12403310321 - 2¹⁰ = 12403309297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12403310293 and 12403310302.

It is not an unprimeable number, because it can be changed into a prime (12403310323) 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, 6674696 + ... + 6676553.

It is an arithmetic number, because the mean of its divisors is an integer number (3104165625).

Almost surely, 2^12403310321 is an apocalyptic number.

It is an amenable number.

12403310321 is a deficient number, since it is larger than the sum of its proper divisors (13352179).

12403310321 is an equidigital number, since it uses as much as digits as its factorization.

12403310321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13352178.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12403310321 its reverse (12301330421), we get a palindrome (24704640742).

The spelling of 12403310321 in words is "twelve billion, four hundred three million, three hundred ten thousand, three hundred twenty-one".