129223020 has 24 divisors (see below), whose sum is σ = 361824624. Its totient is φ = 34459456.

The previous prime is 129223019. The next prime is 129223037. The reversal of 129223020 is 20322921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1076799 + ... + 1076918.

It is an arithmetic number, because the mean of its divisors is an integer number (15076026).

Almost surely, 2^129223020 is an apocalyptic number.

129223020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129223020 is an abundant number, since it is smaller than the sum of its proper divisors (232601604).

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

129223020 is a wasteful number, since it uses less digits than its factorization.

129223020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153729 (or 2153727 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 129223020 is about 11367.6303599299. The cubic root of 129223020 is about 505.5684478905.

Adding to 129223020 its reverse (20322921), we get a palindrome (149545941).

The spelling of 129223020 in words is "one hundred twenty-nine million, two hundred twenty-three thousand, twenty".