12521855 has 16 divisors (see below), whose sum is σ = 16005600. Its totient is φ = 9377280.

The previous prime is 12521837. The next prime is 12521857. The reversal of 12521855 is 55812521.

It is not a de Polignac number, because 12521855 - 2¹⁰ = 12520831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521857) 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, 7715 + ... + 9195.

It is an arithmetic number, because the mean of its divisors is an integer number (1000350).

Almost surely, 2^12521855 is an apocalyptic number.

12521855 is a deficient number, since it is larger than the sum of its proper divisors (3483745).

12521855 is a wasteful number, since it uses less digits than its factorization.

12521855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594.

The product of its digits is 4000, while the sum is 29.

The square root of 12521855 is about 3538.6233198802. The cubic root of 12521855 is about 232.2146188286.

The spelling of 12521855 in words is "twelve million, five hundred twenty-one thousand, eight hundred fifty-five".