12521424 has 20 divisors (see below), whose sum is σ = 32347136. Its totient is φ = 4173792.

The previous prime is 12521381. The next prime is 12521447. The reversal of 12521424 is 42412521.

It is a self number, because there is not a number n which added to its sum of digits gives 12521424.

It is a congruent number.

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, 130384 + ... + 130479.

Almost surely, 2^12521424 is an apocalyptic number.

It is an amenable number.

12521424 is an abundant number, since it is smaller than the sum of its proper divisors (19825712).

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

12521424 is a wasteful number, since it uses less digits than its factorization.

12521424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260874 (or 260868 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 12521424 is about 3538.5624199666. The cubic root of 12521424 is about 232.2119545362.

Adding to 12521424 its reverse (42412521), we get a palindrome (54933945).

The spelling of 12521424 in words is "twelve million, five hundred twenty-one thousand, four hundred twenty-four".