12521881 has 8 divisors (see below), whose sum is σ = 13230720. Its totient is φ = 11831568.

The previous prime is 12521863. The next prime is 12521891. The reversal of 12521881 is 18812521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12521881 - 2⁷ = 12521753 is a prime.

It is a super-2 number, since 2×12521881² = 313595007556322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521801) 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 7 ways as a sum of consecutive naturals, for example, 3231 + ... + 5956.

It is an arithmetic number, because the mean of its divisors is an integer number (1653840).

Almost surely, 2^12521881 is an apocalyptic number.

It is an amenable number.

12521881 is a deficient number, since it is larger than the sum of its proper divisors (708839).

12521881 is an equidigital number, since it uses as much as digits as its factorization.

12521881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9263.

The product of its digits is 1280, while the sum is 28.

The square root of 12521881 is about 3538.6269936234. The cubic root of 12521881 is about 232.2147795496.

The spelling of 12521881 in words is "twelve million, five hundred twenty-one thousand, eight hundred eighty-one".