12168521 has 4 divisors (see below), whose sum is σ = 12177792. Its totient is φ = 12159252.

The previous prime is 12168517. The next prime is 12168551. The reversal of 12168521 is 12586121.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12586121 = 109 ⋅115469.

It is a cyclic number.

It is not a de Polignac number, because 12168521 - 2² = 12168517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12168511) 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, 2261 + ... + 5426.

It is an arithmetic number, because the mean of its divisors is an integer number (3044448).

Almost surely, 2^12168521 is an apocalyptic number.

It is an amenable number.

12168521 is a deficient number, since it is larger than the sum of its proper divisors (9271).

12168521 is an equidigital number, since it uses as much as digits as its factorization.

12168521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9270.

The product of its digits is 960, while the sum is 26.

The square root of 12168521 is about 3488.3407230372. The cubic root of 12168521 is about 230.0095837216.

The spelling of 12168521 in words is "twelve million, one hundred sixty-eight thousand, five hundred twenty-one".