129212229 has 16 divisors (see below), whose sum is σ = 181563264. Its totient is φ = 81576000.

The previous prime is 129212191. The next prime is 129212231. The reversal of 129212229 is 922212921.

It is not a de Polignac number, because 129212229 - 2⁷ = 129212101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129212196 and 129212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129212269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2302 + ... + 16239.

It is an arithmetic number, because the mean of its divisors is an integer number (11347704).

Almost surely, 2^129212229 is an apocalyptic number.

It is an amenable number.

129212229 is a deficient number, since it is larger than the sum of its proper divisors (52351035).

129212229 is a wasteful number, since it uses less digits than its factorization.

129212229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18668.

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

The square root of 129212229 is about 11367.1557128422. The cubic root of 129212229 is about 505.5543746988.

The spelling of 129212229 in words is "one hundred twenty-nine million, two hundred twelve thousand, two hundred twenty-nine".