12073521 has 4 divisors (see below), whose sum is σ = 16098032. Its totient is φ = 8049012.

The previous prime is 12073513. The next prime is 12073549. The reversal of 12073521 is 12537021.

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 not a de Polignac number, because 12073521 - 2³ = 12073513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12073511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012251 + ... + 2012256.

It is an arithmetic number, because the mean of its divisors is an integer number (4024508).

Almost surely, 2^12073521 is an apocalyptic number.

It is an amenable number.

12073521 is a deficient number, since it is larger than the sum of its proper divisors (4024511).

12073521 is an equidigital number, since it uses as much as digits as its factorization.

12073521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024510.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 12073521 is about 3474.6972529992. The cubic root of 12073521 is about 229.4094554086.

The spelling of 12073521 in words is "twelve million, seventy-three thousand, five hundred twenty-one".