129921354528 has 48 divisors (see below), whose sum is σ = 389764065600. Its totient is φ = 37120386816.

The previous prime is 129921354473. The next prime is 129921354553. The reversal of 129921354528 is 825453129921.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×129921354528² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96667003 + ... + 96668346.

It is an arithmetic number, because the mean of its divisors is an integer number (8120084700).

Almost surely, 2^129921354528 is an apocalyptic number.

It is an amenable number.

129921354528 is an abundant number, since it is smaller than the sum of its proper divisors (259842711072).

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

129921354528 is a wasteful number, since it uses less digits than its factorization.

129921354528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193335369 (or 193335361 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 51.

The spelling of 129921354528 in words is "one hundred twenty-nine billion, nine hundred twenty-one million, three hundred fifty-four thousand, five hundred twenty-eight".