129888888921 has 24 divisors (see below), whose sum is σ = 209665441440. Its totient is φ = 76800523200.

The previous prime is 129888888919. The next prime is 129888888953.

It is a happy number.

129888888921 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 129888888921 - 2¹ = 129888888919 is a prime.

It is a super-2 number, since 2×129888888921² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129888888921.

It is not an unprimeable number, because it can be changed into a prime (129888888971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15996051 + ... + 16004168.

It is an arithmetic number, because the mean of its divisors is an integer number (8736060060).

Almost surely, 2^129888888921 is an apocalyptic number.

129888888921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129888888921 is a deficient number, since it is larger than the sum of its proper divisors (79776552519).

129888888921 is a wasteful number, since it uses less digits than its factorization.

129888888921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32000277 (or 32000274 counting only the distinct ones).

The product of its digits is 84934656, while the sum is 72.

The spelling of 129888888921 in words is "one hundred twenty-nine billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred twenty-one".