12928521 has 16 divisors (see below), whose sum is σ = 17664768. Its totient is φ = 8408400.

The previous prime is 12928511. The next prime is 12928537. The reversal of 12928521 is 12582921.

It is not a de Polignac number, because 12928521 - 2⁷ = 12928393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12928501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26086 + ... + 26576.

It is an arithmetic number, because the mean of its divisors is an integer number (1104048).

Almost surely, 2^12928521 is an apocalyptic number.

It is an amenable number.

12928521 is a deficient number, since it is larger than the sum of its proper divisors (4736247).

12928521 is a wasteful number, since it uses less digits than its factorization.

12928521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its digits is 2880, while the sum is 30.

The square root of 12928521 is about 3595.6252585607. The cubic root of 12928521 is about 234.7017250892.

The spelling of 12928521 in words is "twelve million, nine hundred twenty-eight thousand, five hundred twenty-one".