129792224015921 has 2 divisors, whose sum is σ = 129792224015922. Its totient is φ = 129792224015920.

The previous prime is 129792224015917. The next prime is 129792224015959. The reversal of 129792224015921 is 129510422297921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73138602556321 + 56653621459600 = 8552111^2 + 7526860^2 .

It is a cyclic number.

It is not a de Polignac number, because 129792224015921 - 2² = 129792224015917 is a prime.

It is a super-2 number, since 2×129792224015921² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129792224015021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64896112007960 + 64896112007961.

It is an arithmetic number, because the mean of its divisors is an integer number (64896112007961).

Almost surely, 2^{129792224015921} is an apocalyptic number.

It is an amenable number.

129792224015921 is a deficient number, since it is larger than the sum of its proper divisors (1).

129792224015921 is an equidigital number, since it uses as much as digits as its factorization.

129792224015921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 129792224015921 in words is "one hundred twenty-nine trillion, seven hundred ninety-two billion, two hundred twenty-four million, fifteen thousand, nine hundred twenty-one".