129213522 has 32 divisors (see below), whose sum is σ = 287736960. Its totient is φ = 42981840.

The previous prime is 129213499. The next prime is 129213529. The reversal of 129213522 is 225312921.

It is a happy number.

129213522 is a `hidden beast` number, since 129 + 2 + 13 + 522 = 666.

It is a super-2 number, since 2×129213522² = 33392268535288968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (129213529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27003 + ... + 31425.

It is an arithmetic number, because the mean of its divisors is an integer number (8991780).

Almost surely, 2^129213522 is an apocalyptic number.

129213522 is an abundant number, since it is smaller than the sum of its proper divisors (158523438).

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

129213522 is a wasteful number, since it uses less digits than its factorization.

129213522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975 (or 4969 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 129213522 is about 11367.2125870857. The cubic root of 129213522 is about 505.5560610191.

The spelling of 129213522 in words is "one hundred twenty-nine million, two hundred thirteen thousand, five hundred twenty-two".