12129999979 has 2 divisors, whose sum is σ = 12129999980. Its totient is φ = 12129999978.

The previous prime is 12129999967. The next prime is 12130000009. The reversal of 12129999979 is 97999992121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12129999979 - 2¹³ = 12129991787 is a prime.

It is not a weakly prime, because it can be changed into another prime (12129999949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064999989 + 6064999990.

It is an arithmetic number, because the mean of its divisors is an integer number (6064999990).

Almost surely, 2^12129999979 is an apocalyptic number.

12129999979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12129999979 is an equidigital number, since it uses as much as digits as its factorization.

12129999979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14880348, while the sum is 67.

The spelling of 12129999979 in words is "twelve billion, one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-nine".