129421170 has 48 divisors (see below), whose sum is σ = 356293080. Its totient is φ = 32481792.

The previous prime is 129421169. The next prime is 129421211. The reversal of 129421170 is 71124921.

It can be written as a sum of positive squares in 4 ways, for example, as 127441521 + 1979649 = 11289^2 + 1407^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40765 + ... + 43824.

Almost surely, 2^129421170 is an apocalyptic number.

129421170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129421170 is an abundant number, since it is smaller than the sum of its proper divisors (226871910).

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

129421170 is a wasteful number, since it uses less digits than its factorization.

129421170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84619 (or 84616 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 129421170 is about 11376.3425581335. The cubic root of 129421170 is about 505.8267280513.

The spelling of 129421170 in words is "one hundred twenty-nine million, four hundred twenty-one thousand, one hundred seventy".