128332521 has 12 divisors (see below), whose sum is σ = 186250480. Its totient is φ = 85148280.

The previous prime is 128332469. The next prime is 128332543. The reversal of 128332521 is 125233821.

It is not a de Polignac number, because 128332521 - 2¹¹ = 128330473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128336521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31891 + ... + 35688.

Almost surely, 2^128332521 is an apocalyptic number.

It is an amenable number.

128332521 is a deficient number, since it is larger than the sum of its proper divisors (57917959).

128332521 is a wasteful number, since it uses less digits than its factorization.

128332521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67796 (or 67793 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 128332521 is about 11328.3944581746. The cubic root of 128332521 is about 504.4044490666.

The spelling of 128332521 in words is "one hundred twenty-eight million, three hundred thirty-two thousand, five hundred twenty-one".