129697363796921 has 8 divisors (see below), whose sum is σ = 135498099429000. Its totient is φ = 123985189014400.

The previous prime is 129697363796893. The next prime is 129697363796927.

129697363796921 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 75842152387600 + 53855211409321 = 8708740^2 + 7338611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129697363796921 - 2⁶ = 129697363796857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129697363796927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22140209396 + ... + 22140215253.

It is an arithmetic number, because the mean of its divisors is an integer number (16937262428625).

Almost surely, 2^{129697363796921} is an apocalyptic number.

It is an amenable number.

129697363796921 is a deficient number, since it is larger than the sum of its proper divisors (5800735632079).

129697363796921 is a wasteful number, since it uses less digits than its factorization.

129697363796921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44280424779.

The product of its digits is 2499898464, while the sum is 80.

The spelling of 129697363796921 in words is "one hundred twenty-nine trillion, six hundred ninety-seven billion, three hundred sixty-three million, seven hundred ninety-six thousand, nine hundred twenty-one".