129221229 has 8 divisors (see below), whose sum is σ = 172348960. Its totient is φ = 86120496.

The previous prime is 129221227. The next prime is 129221243. The reversal of 129221229 is 922122921.

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

It is not a de Polignac number, because 129221229 - 2¹ = 129221227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129221196 and 129221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129221227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11379 + ... + 19695.

It is an arithmetic number, because the mean of its divisors is an integer number (21543620).

Almost surely, 2^129221229 is an apocalyptic number.

It is an amenable number.

129221229 is a deficient number, since it is larger than the sum of its proper divisors (43127731).

129221229 is an equidigital number, since it uses as much as digits as its factorization.

129221229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13499.

The product of its digits is 2592, while the sum is 30.

The square root of 129221229 is about 11367.5515833446. The cubic root of 129221229 is about 505.5661121940.

The spelling of 129221229 in words is "one hundred twenty-nine million, two hundred twenty-one thousand, two hundred twenty-nine".