12465256421 has 4 divisors (see below), whose sum is σ = 12586278432. Its totient is φ = 12344234412.

The previous prime is 12465256381. The next prime is 12465256423.

12465256421 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12465256421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12465256423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60510851 + ... + 60511056.

It is an arithmetic number, because the mean of its divisors is an integer number (3146569608).

Almost surely, 2^12465256421 is an apocalyptic number.

It is an amenable number.

12465256421 is a deficient number, since it is larger than the sum of its proper divisors (121022011).

12465256421 is a wasteful number, since it uses less digits than its factorization.

12465256421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121022010.

The product of its digits is 115200, while the sum is 38.

The spelling of 12465256421 in words is "twelve billion, four hundred sixty-five million, two hundred fifty-six thousand, four hundred twenty-one".