12556448821 has 8 divisors (see below), whose sum is σ = 14366939840. Its totient is φ = 10750135968.

The previous prime is 12556448767. The next prime is 12556448831. The reversal of 12556448821 is 12884465521.

12556448821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12556448821 - 2²⁵ = 12522894389 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 (12556448831) 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 7 ways as a sum of consecutive naturals, for example, 1038096 + ... + 1050121.

It is an arithmetic number, because the mean of its divisors is an integer number (1795867480).

Almost surely, 2^12556448821 is an apocalyptic number.

It is an amenable number.

12556448821 is a deficient number, since it is larger than the sum of its proper divisors (1810491019).

12556448821 is an equidigital number, since it uses as much as digits as its factorization.

12556448821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089083.

The product of its digits is 614400, while the sum is 46.

The spelling of 12556448821 in words is "twelve billion, five hundred fifty-six million, four hundred forty-eight thousand, eight hundred twenty-one".