12327780921 has 4 divisors (see below), whose sum is σ = 16437041232. Its totient is φ = 8218520612.

The previous prime is 12327780919. The next prime is 12327780961. The reversal of 12327780921 is 12908772321.

12327780921 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.

It is a cyclic number.

It is not a de Polignac number, because 12327780921 - 2¹ = 12327780919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12327780961) 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, 2054630151 + ... + 2054630156.

It is an arithmetic number, because the mean of its divisors is an integer number (4109260308).

Almost surely, 2^12327780921 is an apocalyptic number.

It is an amenable number.

12327780921 is a deficient number, since it is larger than the sum of its proper divisors (4109260311).

12327780921 is an equidigital number, since it uses as much as digits as its factorization.

12327780921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109260310.

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 12327780921 in words is "twelve billion, three hundred twenty-seven million, seven hundred eighty thousand, nine hundred twenty-one".