12129861334309 has 2 divisors, whose sum is σ = 12129861334310. Its totient is φ = 12129861334308.

The previous prime is 12129861334291. The next prime is 12129861334411. The reversal of 12129861334309 is 90343316892121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12121385370084 + 8475964225 = 3481578^2 + 92065^2 .

It is a cyclic number.

It is not a de Polignac number, because 12129861334309 - 2¹⁵ = 12129861301541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12129861334709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064930667154 + 6064930667155.

It is an arithmetic number, because the mean of its divisors is an integer number (6064930667155).

Almost surely, 2^{12129861334309} is an apocalyptic number.

It is an amenable number.

12129861334309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12129861334309 is an equidigital number, since it uses as much as digits as its factorization.

12129861334309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 12129861334309 in words is "twelve trillion, one hundred twenty-nine billion, eight hundred sixty-one million, three hundred thirty-four thousand, three hundred nine".