12521328 has 20 divisors (see below), whose sum is σ = 32346888. Its totient is φ = 4173760.

The previous prime is 12521309. The next prime is 12521329. The reversal of 12521328 is 82312521.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 12521298 and 12521307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521329) 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, 130383 + ... + 130478.

Almost surely, 2^12521328 is an apocalyptic number.

It is an amenable number.

12521328 is an abundant number, since it is smaller than the sum of its proper divisors (19825560).

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

12521328 is a wasteful number, since it uses less digits than its factorization.

12521328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260872 (or 260866 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 12521328 is about 3538.5488551100. The cubic root of 12521328 is about 232.2113610892.

Adding to 12521328 its reverse (82312521), we get a palindrome (94833849).

The spelling of 12521328 in words is "twelve million, five hundred twenty-one thousand, three hundred twenty-eight".