129012922321 has 2 divisors, whose sum is σ = 129012922322. Its totient is φ = 129012922320.

The previous prime is 129012922309. The next prime is 129012922349. The reversal of 129012922321 is 123229210921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103272249600 + 25740672721 = 321360^2 + 160439^2 .

It is a cyclic number.

It is not a de Polignac number, because 129012922321 - 2⁷ = 129012922193 is a prime.

It is not a weakly prime, because it can be changed into another prime (129012922351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64506461160 + 64506461161.

It is an arithmetic number, because the mean of its divisors is an integer number (64506461161).

Almost surely, 2^129012922321 is an apocalyptic number.

It is an amenable number.

129012922321 is a deficient number, since it is larger than the sum of its proper divisors (1).

129012922321 is an equidigital number, since it uses as much as digits as its factorization.

129012922321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 129012922321 in words is "one hundred twenty-nine billion, twelve million, nine hundred twenty-two thousand, three hundred twenty-one".