129962721 has 32 divisors (see below), whose sum is σ = 201369600. Its totient is φ = 73028736.

The previous prime is 129962689. The next prime is 129962737. The reversal of 129962721 is 127269921.

It is not a de Polignac number, because 129962721 - 2⁵ = 129962689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129962721.

It is not an unprimeable number, because it can be changed into a prime (129962221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 572410 + ... + 572636.

It is an arithmetic number, because the mean of its divisors is an integer number (6292800).

Almost surely, 2^129962721 is an apocalyptic number.

It is an amenable number.

129962721 is a deficient number, since it is larger than the sum of its proper divisors (71406879).

129962721 is a wasteful number, since it uses less digits than its factorization.

129962721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573.

The product of its digits is 27216, while the sum is 39.

The square root of 129962721 is about 11400.1193414806. The cubic root of 129962721 is about 506.5312747559.

The spelling of 129962721 in words is "one hundred twenty-nine million, nine hundred sixty-two thousand, seven hundred twenty-one".