12521685 has 24 divisors (see below), whose sum is σ = 22024800. Its totient is φ = 6070240.

The previous prime is 12521669. The next prime is 12521689. The reversal of 12521685 is 58612521.

It is not a de Polignac number, because 12521685 - 2⁴ = 12521669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1635 + ... + 5264.

It is an arithmetic number, because the mean of its divisors is an integer number (917700).

Almost surely, 2^12521685 is an apocalyptic number.

12521685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12521685 is a deficient number, since it is larger than the sum of its proper divisors (9503115).

12521685 is a wasteful number, since it uses less digits than its factorization.

12521685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929 (or 6918 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 12521685 is about 3538.5992991578. The cubic root of 12521685 is about 232.2135679549.

The spelling of 12521685 in words is "twelve million, five hundred twenty-one thousand, six hundred eighty-five".