129255421 has 4 divisors (see below), whose sum is σ = 130510432. Its totient is φ = 128000412.

The previous prime is 129255419. The next prime is 129255481. The reversal of 129255421 is 124552921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129255421 - 2¹ = 129255419 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 (129255481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627351 + ... + 627556.

It is an arithmetic number, because the mean of its divisors is an integer number (32627608).

Almost surely, 2^129255421 is an apocalyptic number.

It is an amenable number.

129255421 is a deficient number, since it is larger than the sum of its proper divisors (1255011).

129255421 is a wasteful number, since it uses less digits than its factorization.

129255421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255010.

The product of its digits is 7200, while the sum is 31.

The square root of 129255421 is about 11369.0554137096. The cubic root of 129255421 is about 505.6106992746.

The spelling of 129255421 in words is "one hundred twenty-nine million, two hundred fifty-five thousand, four hundred twenty-one".