129027935521 has 8 divisors (see below), whose sum is σ = 129602269440. Its totient is φ = 128453889312.

The previous prime is 129027935419. The next prime is 129027935549. The reversal of 129027935521 is 125539720921.

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 129027935521 - 2¹⁵ = 129027902753 is a prime.

It is a super-2 number, since 2×129027935521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129027935581) 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, 853381 + ... + 993133.

It is an arithmetic number, because the mean of its divisors is an integer number (16200283680).

Almost surely, 2^129027935521 is an apocalyptic number.

It is an amenable number.

129027935521 is a deficient number, since it is larger than the sum of its proper divisors (574333919).

129027935521 is a wasteful number, since it uses less digits than its factorization.

129027935521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143855.

The product of its (nonzero) digits is 340200, while the sum is 46.

The spelling of 129027935521 in words is "one hundred twenty-nine billion, twenty-seven million, nine hundred thirty-five thousand, five hundred twenty-one".