129660212 has 18 divisors (see below), whose sum is σ = 249409314. Its totient is φ = 58936240.

The previous prime is 129660203. The next prime is 129660217. The reversal of 129660212 is 212066921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 122456356 + 7203856 = 11066^2 + 2684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129660217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133463 + ... + 134430.

It is an arithmetic number, because the mean of its divisors is an integer number (13856073).

Almost surely, 2^129660212 is an apocalyptic number.

It is an amenable number.

129660212 is a deficient number, since it is larger than the sum of its proper divisors (119749102).

129660212 is a wasteful number, since it uses less digits than its factorization.

129660212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267919 (or 267906 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 129660212 is about 11386.8438120491. The cubic root of 129660212 is about 506.1379586021.

The spelling of 129660212 in words is "one hundred twenty-nine million, six hundred sixty thousand, two hundred twelve".