12105521 has 8 divisors (see below), whose sum is σ = 12713280. Its totient is φ = 11504592.

The previous prime is 12105491. The next prime is 12105523. The reversal of 12105521 is 12550121.

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 12105521 - 2²² = 7911217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12105521.

It is not an unprimeable number, because it can be changed into a prime (12105523) 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, 2135 + ... + 5363.

It is an arithmetic number, because the mean of its divisors is an integer number (1589160).

Almost surely, 2^12105521 is an apocalyptic number.

It is an amenable number.

12105521 is a deficient number, since it is larger than the sum of its proper divisors (607759).

12105521 is a wasteful number, since it uses less digits than its factorization.

12105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12105521 is about 3479.2989236339. The cubic root of 12105521 is about 229.6119543708.

Adding to 12105521 its reverse (12550121), we get a palindrome (24655642).

The spelling of 12105521 in words is "twelve million, one hundred five thousand, five hundred twenty-one".