12553430321 has 4 divisors (see below), whose sum is σ = 13214137200. Its totient is φ = 11892723444.

The previous prime is 12553430287. The next prime is 12553430333. The reversal of 12553430321 is 12303435521.

It is a happy number.

12553430321 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12303435521 = 13 ⋅946418117.

It is a cyclic number.

It is not a de Polignac number, because 12553430321 - 2³⁰ = 11479688497 is a prime.

It is a super-2 number, since 2×12553430321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12553430221) 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, 330353411 + ... + 330353448.

It is an arithmetic number, because the mean of its divisors is an integer number (3303534300).

Almost surely, 2^12553430321 is an apocalyptic number.

It is an amenable number.

12553430321 is a deficient number, since it is larger than the sum of its proper divisors (660706879).

12553430321 is an equidigital number, since it uses as much as digits as its factorization.

12553430321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660706878.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 12553430321 its reverse (12303435521), we get a palindrome (24856865842).

The spelling of 12553430321 in words is "twelve billion, five hundred fifty-three million, four hundred thirty thousand, three hundred twenty-one".