12579719921 has 2 divisors, whose sum is σ = 12579719922. Its totient is φ = 12579719920.

The previous prime is 12579719879. The next prime is 12579719939. The reversal of 12579719921 is 12991797521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8478726400 + 4100993521 = 92080^2 + 64039^2 .

It is a cyclic number.

It is not a de Polignac number, because 12579719921 - 2¹⁸ = 12579457777 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 (12579710921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6289859960 + 6289859961.

It is an arithmetic number, because the mean of its divisors is an integer number (6289859961).

Almost surely, 2^12579719921 is an apocalyptic number.

It is an amenable number.

12579719921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12579719921 is an equidigital number, since it uses as much as digits as its factorization.

12579719921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 53.

The spelling of 12579719921 in words is "twelve billion, five hundred seventy-nine million, seven hundred nineteen thousand, nine hundred twenty-one".