129216412 has 12 divisors (see below), whose sum is σ = 243523336. Its totient is φ = 59638320.

The previous prime is 129216407. The next prime is 129216427. The reversal of 129216412 is 214612921.

It is a super-2 number, since 2×129216412² = 33393762260307488, which contains 22 as substring.

It is a congruent number.

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, 1242414 + ... + 1242517.

Almost surely, 2^129216412 is an apocalyptic number.

It is an amenable number.

129216412 is a deficient number, since it is larger than the sum of its proper divisors (114306924).

129216412 is a wasteful number, since it uses less digits than its factorization.

129216412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484948 (or 2484946 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 129216412 is about 11367.3397063693. The cubic root of 129216412 is about 505.5598300935.

The spelling of 129216412 in words is "one hundred twenty-nine million, two hundred sixteen thousand, four hundred twelve".