129912220 has 24 divisors (see below), whose sum is σ = 273029904. Its totient is φ = 51924096.

The previous prime is 129912193. The next prime is 129912221. The reversal of 129912220 is 22219921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129912221) 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 7 ways as a sum of consecutive naturals, for example, 48024 + ... + 50656.

It is an arithmetic number, because the mean of its divisors is an integer number (11376246).

Almost surely, 2^129912220 is an apocalyptic number.

129912220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129912220 is an abundant number, since it is smaller than the sum of its proper divisors (143117684).

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

129912220 is a wasteful number, since it uses less digits than its factorization.

129912220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5109 (or 5107 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 129912220 is about 11397.9041933155. The cubic root of 129912220 is about 506.4656568367.

The spelling of 129912220 in words is "one hundred twenty-nine million, nine hundred twelve thousand, two hundred twenty".