12440242321 has 4 divisors (see below), whose sum is σ = 13397184052. Its totient is φ = 11483300592.

The previous prime is 12440242313. The next prime is 12440242349. The reversal of 12440242321 is 12324204421.

12440242321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12324204421 = 2963 ⋅4159367.

It can be written as a sum of positive squares in 2 ways, for example, as 4654650625 + 7785591696 = 68225^2 + 88236^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440242321 - 2³ = 12440242313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440242301) 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 3 ways as a sum of consecutive naturals, for example, 478470846 + ... + 478470871.

It is an arithmetic number, because the mean of its divisors is an integer number (3349296013).

Almost surely, 2^12440242321 is an apocalyptic number.

It is an amenable number.

12440242321 is a deficient number, since it is larger than the sum of its proper divisors (956941731).

12440242321 is an equidigital number, since it uses as much as digits as its factorization.

12440242321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956941730.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 12440242321 its reverse (12324204421), we get a palindrome (24764446742).

The spelling of 12440242321 in words is "twelve billion, four hundred forty million, two hundred forty-two thousand, three hundred twenty-one".