42521128 has 16 divisors (see below), whose sum is σ = 85860180. Its totient is φ = 19625088.

The previous prime is 42521117. The next prime is 42521153. The reversal of 42521128 is 82112524.

It can be written as a sum of positive squares in 2 ways, for example, as 36942084 + 5579044 = 6078^2 + 2362^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204325 + ... + 204532.

Almost surely, 2^42521128 is an apocalyptic number.

It is an amenable number.

42521128 is an abundant number, since it is smaller than the sum of its proper divisors (43339052).

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

42521128 is a wasteful number, since it uses less digits than its factorization.

42521128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408876 (or 408872 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 42521128 is about 6520.8226474886. The cubic root of 42521128 is about 349.0344216096.

The spelling of 42521128 in words is "forty-two million, five hundred twenty-one thousand, one hundred twenty-eight".