129922131958921 has 9 divisors (see below), whose sum is σ = 132420360761479. Its totient is φ = 127470178264936.

The previous prime is 129922131958901. The next prime is 129922131958939. The reversal of 129922131958921 is 129859131229921.

The square root of 129922131958921 is 11398339.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 93660490287225 + 36261641671696 = 9677835^2 + 6021764^2 .

It is not a de Polignac number, because 129922131958921 - 2¹⁷ = 129922131827849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129922131958901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 604004436 + ... + 604219498.

Almost surely, 2^{129922131958921} is an apocalyptic number.

129922131958921 is the 11398339-th square number.

129922131958921 is the 5699170-th centered octagonal number.

It is an amenable number.

129922131958921 is a deficient number, since it is larger than the sum of its proper divisors (2498228802558).

129922131958921 is an frugal number, since it uses more digits than its factorization.

129922131958921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430232 (or 215116 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 64.

The spelling of 129922131958921 in words is "one hundred twenty-nine trillion, nine hundred twenty-two billion, one hundred thirty-one million, nine hundred fifty-eight thousand, nine hundred twenty-one".