12389000821 has 4 divisors (see below), whose sum is σ = 12436107552. Its totient is φ = 12341894092.

The previous prime is 12389000809. The next prime is 12389000839. The reversal of 12389000821 is 12800098321.

12389000821 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: 12800098321 = 59 ⋅216950819.

It is a cyclic number.

It is not a de Polignac number, because 12389000821 - 2⁷ = 12389000693 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 (12389000881) 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, 23552971 + ... + 23553496.

It is an arithmetic number, because the mean of its divisors is an integer number (3109026888).

Almost surely, 2^12389000821 is an apocalyptic number.

12389000821 is the 59496-th centered heptagonal number.

It is an amenable number.

12389000821 is a deficient number, since it is larger than the sum of its proper divisors (47106731).

12389000821 is an equidigital number, since it uses as much as digits as its factorization.

12389000821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47106730.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 12389000821 in words is "twelve billion, three hundred eighty-nine million, eight hundred twenty-one", and thus it is an aban number.