129933221 has 8 divisors (see below), whose sum is σ = 142260384. Its totient is φ = 117691920.

The previous prime is 129933217. The next prime is 129933241. The reversal of 129933221 is 122339921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129933221 - 2² = 129933217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129933241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18275 + ... + 24368.

It is an arithmetic number, because the mean of its divisors is an integer number (17782548).

Almost surely, 2^129933221 is an apocalyptic number.

129933221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129933221 is a deficient number, since it is larger than the sum of its proper divisors (12327163).

129933221 is a wasteful number, since it uses less digits than its factorization.

129933221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42931.

The product of its digits is 5832, while the sum is 32.

The square root of 129933221 is about 11398.8254219459. The cubic root of 129933221 is about 506.4929463203.

The spelling of 129933221 in words is "one hundred twenty-nine million, nine hundred thirty-three thousand, two hundred twenty-one".