12103521 has 4 divisors (see below), whose sum is σ = 16138032. Its totient is φ = 8069012.

The previous prime is 12103517. The next prime is 12103529. The reversal of 12103521 is 12530121.

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 12103521 - 2² = 12103517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12103521.

It is not an unprimeable number, because it can be changed into a prime (12103529) 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, 2017251 + ... + 2017256.

It is an arithmetic number, because the mean of its divisors is an integer number (4034508).

Almost surely, 2^12103521 is an apocalyptic number.

It is an amenable number.

12103521 is a deficient number, since it is larger than the sum of its proper divisors (4034511).

12103521 is an equidigital number, since it uses as much as digits as its factorization.

12103521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034510.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 12103521 is about 3479.0114975378. The cubic root of 12103521 is about 229.5993086476.

Adding to 12103521 its reverse (12530121), we get a palindrome (24633642).

The spelling of 12103521 in words is "twelve million, one hundred three thousand, five hundred twenty-one".