129222912 has 216 divisors, whose sum is σ = 433360704. Its totient is φ = 33288192.

The previous prime is 129222893. The next prime is 129222913. The reversal of 129222912 is 219222921.

It is a self number, because there is not a number n which added to its sum of digits gives 129222912.

It is not an unprimeable number, because it can be changed into a prime (129222913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3005163 + ... + 3005205.

Almost surely, 2^129222912 is an apocalyptic number.

129222912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129222912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216680352).

129222912 is an abundant number, since it is smaller than the sum of its proper divisors (304137792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129222912 is an equidigital number, since it uses as much as digits as its factorization.

129222912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 68 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 129222912 is about 11367.6256095985. The cubic root of 129222912 is about 505.5683070451.

Subtracting 129222912 from its reverse (219222921), we obtain a palindrome (90000009).

The spelling of 129222912 in words is "one hundred twenty-nine million, two hundred twenty-two thousand, nine hundred twelve".