129621315388392 has 24 divisors (see below), whose sum is σ = 351057729177090. Its totient is φ = 43207105129440.

The previous prime is 129621315388361. The next prime is 129621315388441. The reversal of 129621315388392 is 293883513126921.

129621315388392 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 2 + 1 + 3 + 1 + 538 + 8 + 3 + 92 = 666.

It can be written as a sum of positive squares in only one way, i.e., 109858613971716 + 19762701416676 = 10481346^2 + 4445526^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 900148023459 + ... + 900148023602.

Almost surely, 2^{129621315388392} is an apocalyptic number.

129621315388392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129621315388392 is an abundant number, since it is smaller than the sum of its proper divisors (221436413788698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129621315388392 is a wasteful number, since it uses less digits than its factorization.

129621315388392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800296047073 (or 1800296047066 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The spelling of 129621315388392 in words is "one hundred twenty-nine trillion, six hundred twenty-one billion, three hundred fifteen million, three hundred eighty-eight thousand, three hundred ninety-two".