129421668 has 24 divisors (see below), whose sum is σ = 305099872. Its totient is φ = 42695424.

The previous prime is 129421639. The next prime is 129421723. The reversal of 129421668 is 866124921.

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, 54430 + ... + 56757.

Almost surely, 2^129421668 is an apocalyptic number.

It is an amenable number.

129421668 is an abundant number, since it is smaller than the sum of its proper divisors (175678204).

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

129421668 is a wasteful number, since it uses less digits than its factorization.

129421668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111291 (or 111289 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 129421668 is about 11376.3644456390. The cubic root of 129421668 is about 505.8273768411.

The spelling of 129421668 in words is "one hundred twenty-nine million, four hundred twenty-one thousand, six hundred sixty-eight".