129720222 has 24 divisors (see below), whose sum is σ = 281454264. Its totient is φ = 43179504.

The previous prime is 129720211. The next prime is 129720229. The reversal of 129720222 is 222027921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129720229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9253 + ... + 18575.

It is an arithmetic number, because the mean of its divisors is an integer number (11727261).

Almost surely, 2^129720222 is an apocalyptic number.

129720222 is an abundant number, since it is smaller than the sum of its proper divisors (151734042).

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

129720222 is a wasteful number, since it uses less digits than its factorization.

129720222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10104 (or 10101 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 129720222 is about 11389.4785657641. The cubic root of 129720222 is about 506.2160310084.

The spelling of 129720222 in words is "one hundred twenty-nine million, seven hundred twenty thousand, two hundred twenty-two".