129211 has 4 divisors (see below), whose sum is σ = 130192. Its totient is φ = 128232.

The previous prime is 129209. The next prime is 129221. The reversal of 129211 is 112921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 129211 - 2¹ = 129209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255 + ... + 568.

It is an arithmetic number, because the mean of its divisors is an integer number (32548).

2¹²⁹²¹¹ is an apocalyptic number.

129211 is a deficient number, since it is larger than the sum of its proper divisors (981).

129211 is an equidigital number, since it uses as much as digits as its factorization.

129211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its digits is 36, while the sum is 16.

The square root of 129211 is about 359.4593161959. The cubic root of 129211 is about 50.5552771836. Note that the first 3 decimals are identical.

Subtracting from 129211 its reverse (112921), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 129211 in words is "one hundred twenty-nine thousand, two hundred eleven".