12961223279 has 4 divisors (see below), whose sum is σ = 12961693776. Its totient is φ = 12960752784.

The previous prime is 12961223273. The next prime is 12961223291. The reversal of 12961223279 is 97232216921.

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

It is a cyclic number.

It is not a de Polignac number, because 12961223279 - 2⁴ = 12961223263 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 (12961223273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191174 + ... + 249939.

It is an arithmetic number, because the mean of its divisors is an integer number (3240423444).

Almost surely, 2^12961223279 is an apocalyptic number.

12961223279 is a deficient number, since it is larger than the sum of its proper divisors (470497).

12961223279 is an equidigital number, since it uses as much as digits as its factorization.

12961223279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470496.

The product of its digits is 163296, while the sum is 44.

The spelling of 12961223279 in words is "twelve billion, nine hundred sixty-one million, two hundred twenty-three thousand, two hundred seventy-nine".