129820211 has 24 divisors (see below), whose sum is σ = 149778720. Its totient is φ = 111786752.

The previous prime is 129820183. The next prime is 129820213. The reversal of 129820211 is 112028921.

It is not a de Polignac number, because 129820211 - 2¹⁰ = 129819187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129820213) 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 23 ways as a sum of consecutive naturals, for example, 1213220 + ... + 1213326.

It is an arithmetic number, because the mean of its divisors is an integer number (6240780).

Almost surely, 2^129820211 is an apocalyptic number.

129820211 is a deficient number, since it is larger than the sum of its proper divisors (19958509).

129820211 is a wasteful number, since it uses less digits than its factorization.

129820211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 129820211 is about 11393.8672539222. The cubic root of 129820211 is about 506.3460622260.

It can be divided in two parts, 129820 and 211, that added together give a palindrome (130031).

The spelling of 129820211 in words is "one hundred twenty-nine million, eight hundred twenty thousand, two hundred eleven".