12645097921 has 8 divisors (see below), whose sum is σ = 12775962600. Its totient is φ = 12514846848.

The previous prime is 12645097919. The next prime is 12645097937. The reversal of 12645097921 is 12979054621.

12645097921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 932447296 + 11712650625 = 30536^2 + 108225^2 .

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 12645097921 - 2¹ = 12645097919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12645092921) 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, 111916 + ... + 194461.

It is an arithmetic number, because the mean of its divisors is an integer number (1596995325).

Almost surely, 2^12645097921 is an apocalyptic number.

It is an amenable number.

12645097921 is a deficient number, since it is larger than the sum of its proper divisors (130864679).

12645097921 is a wasteful number, since it uses less digits than its factorization.

12645097921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306803.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 12645097921 in words is "twelve billion, six hundred forty-five million, ninety-seven thousand, nine hundred twenty-one".