12968968321 has 4 divisors (see below), whose sum is σ = 13000677700. Its totient is φ = 12937258944.

The previous prime is 12968968307. The next prime is 12968968343. The reversal of 12968968321 is 12386986921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12386986921 = 4261 ⋅2907061.

It can be written as a sum of positive squares in 2 ways, for example, as 10289870721 + 2679097600 = 101439^2 + 51760^2 .

It is a cyclic number.

It is not a de Polignac number, because 12968968321 - 2⁵ = 12968968289 is a prime.

It is a super-2 number, since 2×12968968321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12968968351) 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, 15854076 + ... + 15854893.

It is an arithmetic number, because the mean of its divisors is an integer number (3250169425).

Almost surely, 2^12968968321 is an apocalyptic number.

It is an amenable number.

12968968321 is a deficient number, since it is larger than the sum of its proper divisors (31709379).

12968968321 is an equidigital number, since it uses as much as digits as its factorization.

12968968321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31709378.

The product of its digits is 2239488, while the sum is 55.

The spelling of 12968968321 in words is "twelve billion, nine hundred sixty-eight million, nine hundred sixty-eight thousand, three hundred twenty-one".