12365430721 has 6 divisors (see below), whose sum is σ = 14384276610. Its totient is φ = 10598940576.

The previous prime is 12365430713. The next prime is 12365430769. The reversal of 12365430721 is 12703456321.

12365430721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10703971600 + 1661459121 = 103460^2 + 40761^2 .

It is not a de Polignac number, because 12365430721 - 2³ = 12365430713 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12365431721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 126177816 + ... + 126177913.

It is an arithmetic number, because the mean of its divisors is an integer number (2397379435).

Almost surely, 2^12365430721 is an apocalyptic number.

It is an amenable number.

12365430721 is a deficient number, since it is larger than the sum of its proper divisors (2018845889).

12365430721 is an equidigital number, since it uses as much as digits as its factorization.

12365430721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252355743 (or 252355736 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 12365430721 in words is "twelve billion, three hundred sixty-five million, four hundred thirty thousand, seven hundred twenty-one".