129121068 has 12 divisors (see below), whose sum is σ = 301282520. Its totient is φ = 43040352.

The previous prime is 129121061. The next prime is 129121099. The reversal of 129121068 is 860121921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (129121061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5380033 + ... + 5380056.

Almost surely, 2^129121068 is an apocalyptic number.

It is an amenable number.

129121068 is an abundant number, since it is smaller than the sum of its proper divisors (172161452).

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

129121068 is a wasteful number, since it uses less digits than its factorization.

129121068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760096 (or 10760094 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 129121068 is about 11363.1451632020. The cubic root of 129121068 is about 505.4354548792.

Adding to 129121068 its reverse (860121921), we get a palindrome (989242989).

The spelling of 129121068 in words is "one hundred twenty-nine million, one hundred twenty-one thousand, sixty-eight".