129721276 has 6 divisors (see below), whose sum is σ = 227012240. Its totient is φ = 64860636.

The previous prime is 129721243. The next prime is 129721289. The reversal of 129721276 is 672127921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16215156 + ... + 16215163.

Almost surely, 2^129721276 is an apocalyptic number.

It is an amenable number.

129721276 is a deficient number, since it is larger than the sum of its proper divisors (97290964).

129721276 is a wasteful number, since it uses less digits than its factorization.

129721276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32430323 (or 32430321 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 129721276 is about 11389.5248364451. The cubic root of 129721276 is about 506.2174020366.

The spelling of 129721276 in words is "one hundred twenty-nine million, seven hundred twenty-one thousand, two hundred seventy-six".