129212 has 6 divisors (see below), whose sum is σ = 226128. Its totient is φ = 64604.

The previous prime is 129209. The next prime is 129221. The reversal of 129212 is 212921.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16148 + ... + 16155.

It is an arithmetic number, because the mean of its divisors is an integer number (37688).

2¹²⁹²¹² is an apocalyptic number.

It is an amenable number.

129212 is a deficient number, since it is larger than the sum of its proper divisors (96916).

129212 is a wasteful number, since it uses less digits than its factorization.

129212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32307 (or 32305 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 129212 is about 359.4607071712. The cubic root of 129212 is about 50.5554076038. Note that the first 3 decimals are identical.

The spelling of 129212 in words is "one hundred twenty-nine thousand, two hundred twelve".