12523021 has 4 divisors (see below), whose sum is σ = 14312032. Its totient is φ = 10734012.

The previous prime is 12522973. The next prime is 12523073. The reversal of 12523021 is 12032521.

12523021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12523021 - 2¹¹ = 12520973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12522986 and 12523004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12523321) 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 3 ways as a sum of consecutive naturals, for example, 894495 + ... + 894508.

It is an arithmetic number, because the mean of its divisors is an integer number (3578008).

Almost surely, 2^12523021 is an apocalyptic number.

It is an amenable number.

12523021 is a deficient number, since it is larger than the sum of its proper divisors (1789011).

12523021 is an equidigital number, since it uses as much as digits as its factorization.

12523021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789010.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 12523021 is about 3538.7880693819. The cubic root of 12523021 is about 232.2218263294.

Adding to 12523021 its reverse (12032521), we get a palindrome (24555542).

The spelling of 12523021 in words is "twelve million, five hundred twenty-three thousand, twenty-one".