129221064 has 48 divisors (see below), whose sum is σ = 399971520. Its totient is φ = 36920160.

The previous prime is 129221041. The next prime is 129221077. The reversal of 129221064 is 460122921.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127692 + ... + 128699.

It is an arithmetic number, because the mean of its divisors is an integer number (8332740).

Almost surely, 2^129221064 is an apocalyptic number.

129221064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129221064 is an abundant number, since it is smaller than the sum of its proper divisors (270750456).

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

129221064 is a wasteful number, since it uses less digits than its factorization.

129221064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256410 (or 256403 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 129221064 is about 11367.5443258428. The cubic root of 129221064 is about 505.5658970115.

Adding to 129221064 its reverse (460122921), we get a palindrome (589343985).

The spelling of 129221064 in words is "one hundred twenty-nine million, two hundred twenty-one thousand, sixty-four".