12521436 has 12 divisors (see below), whose sum is σ = 29216712. Its totient is φ = 4173808.

The previous prime is 12521381. The next prime is 12521447. The reversal of 12521436 is 63412521.

It is a tau number, because it is divible by the number of its divisors (12).

It is an alternating number because its digits alternate between odd and even.

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, 521715 + ... + 521738.

It is an arithmetic number, because the mean of its divisors is an integer number (2434726).

Almost surely, 2^12521436 is an apocalyptic number.

It is an amenable number.

12521436 is an abundant number, since it is smaller than the sum of its proper divisors (16695276).

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

12521436 is a wasteful number, since it uses less digits than its factorization.

12521436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043460 (or 1043458 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 12521436 is about 3538.5641155700. The cubic root of 12521436 is about 232.2120287169.

Adding to 12521436 its reverse (63412521), we get a palindrome (75933957).

It can be divided in two parts, 125214 and 36, that added together give a triangular number (125250 = T₅₀₀).

The spelling of 12521436 in words is "twelve million, five hundred twenty-one thousand, four hundred thirty-six".