12971254209 has 4 divisors (see below), whose sum is σ = 17295005616. Its totient is φ = 8647502804.

The previous prime is 12971254187. The next prime is 12971254213. The reversal of 12971254209 is 90245217921.

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 12971254209 - 2²¹ = 12969157057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12971254249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2161875699 + ... + 2161875704.

It is an arithmetic number, because the mean of its divisors is an integer number (4323751404).

Almost surely, 2^12971254209 is an apocalyptic number.

It is an amenable number.

12971254209 is a deficient number, since it is larger than the sum of its proper divisors (4323751407).

12971254209 is an equidigital number, since it uses as much as digits as its factorization.

12971254209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323751406.

The product of its (nonzero) digits is 90720, while the sum is 42.

It can be divided in two parts, 129712 and 54209, that added together give a triangular number (183921 = T₆₀₆).

The spelling of 12971254209 in words is "twelve billion, nine hundred seventy-one million, two hundred fifty-four thousand, two hundred nine".