129221265 has 16 divisors (see below), whose sum is σ = 207662400. Its totient is φ = 68615232.

The previous prime is 129221251. The next prime is 129221273. The reversal of 129221265 is 562122921.

It is not a de Polignac number, because 129221265 - 2⁴ = 129221249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15375 + ... + 22244.

It is an arithmetic number, because the mean of its divisors is an integer number (12978900).

Almost surely, 2^129221265 is an apocalyptic number.

129221265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129221265 is a deficient number, since it is larger than the sum of its proper divisors (78441135).

129221265 is a wasteful number, since it uses less digits than its factorization.

129221265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37856.

The product of its digits is 4320, while the sum is 30.

The square root of 129221265 is about 11367.5531667989. The cubic root of 129221265 is about 505.5661591429.

The spelling of 129221265 in words is "one hundred twenty-nine million, two hundred twenty-one thousand, two hundred sixty-five".