129216508 has 12 divisors (see below), whose sum is σ = 228991840. Its totient is φ = 63790272.

The previous prime is 129216499. The next prime is 129216509. The reversal of 129216508 is 805612921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129216509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204141 + ... + 204772.

Almost surely, 2^129216508 is an apocalyptic number.

It is an amenable number.

129216508 is a deficient number, since it is larger than the sum of its proper divisors (99775332).

129216508 is a wasteful number, since it uses less digits than its factorization.

129216508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408996 (or 408994 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 129216508 is about 11367.3439289924. The cubic root of 129216508 is about 505.5599552936.

The spelling of 129216508 in words is "one hundred twenty-nine million, two hundred sixteen thousand, five hundred eight".