12947674921 has 4 divisors (see below), whose sum is σ = 13394146500. Its totient is φ = 12501203344.

The previous prime is 12947674913. The next prime is 12947674931.

It is a happy number.

12947674921 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9462425625 + 3485249296 = 97275^2 + 59036^2 .

It is a cyclic number.

It is not a de Polignac number, because 12947674921 - 2³ = 12947674913 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12947674931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223235746 + ... + 223235803.

It is an arithmetic number, because the mean of its divisors is an integer number (3348536625).

Almost surely, 2^12947674921 is an apocalyptic number.

It is an amenable number.

12947674921 is a deficient number, since it is larger than the sum of its proper divisors (446471579).

12947674921 is an equidigital number, since it uses as much as digits as its factorization.

12947674921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446471578.

The product of its digits is 1524096, while the sum is 52.

The spelling of 12947674921 in words is "twelve billion, nine hundred forty-seven million, six hundred seventy-four thousand, nine hundred twenty-one".