129521072 has 20 divisors (see below), whose sum is σ = 251404296. Its totient is φ = 64642560.

The previous prime is 129521057. The next prime is 129521083. The reversal of 129521072 is 270125921.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048 + ... + 16224.

Almost surely, 2^129521072 is an apocalyptic number.

It is an amenable number.

129521072 is a deficient number, since it is larger than the sum of its proper divisors (121883224).

129521072 is a wasteful number, since it uses less digits than its factorization.

129521072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14756 (or 14750 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 129521072 is about 11380.7324896072. The cubic root of 129521072 is about 505.9568461378.

Adding to 129521072 its reverse (270125921), we get a palindrome (399646993).

The spelling of 129521072 in words is "one hundred twenty-nine million, five hundred twenty-one thousand, seventy-two".