12967289921 has 2 divisors, whose sum is σ = 12967289922. Its totient is φ = 12967289920.

The previous prime is 12967289857. The next prime is 12967289927. The reversal of 12967289921 is 12998276921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12285505600 + 681784321 = 110840^2 + 26111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12967289921 - 2⁶ = 12967289857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12967289927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6483644960 + 6483644961.

It is an arithmetic number, because the mean of its divisors is an integer number (6483644961).

Almost surely, 2^12967289921 is an apocalyptic number.

It is an amenable number.

12967289921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12967289921 is an equidigital number, since it uses as much as digits as its factorization.

12967289921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 56.

The spelling of 12967289921 in words is "twelve billion, nine hundred sixty-seven million, two hundred eighty-nine thousand, nine hundred twenty-one".