11520321 has 4 divisors (see below), whose sum is σ = 15360432. Its totient is φ = 7680212.

The previous prime is 11520307. The next prime is 11520323. The reversal of 11520321 is 12302511.

11520321 is digitally balanced in base 2 and base 4, because in such bases 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 11520321 - 2¹⁹ = 10996033 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11520321.

It is not an unprimeable number, because it can be changed into a prime (11520323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920051 + ... + 1920056.

It is an arithmetic number, because the mean of its divisors is an integer number (3840108).

Almost surely, 2^11520321 is an apocalyptic number.

It is an amenable number.

11520321 is a deficient number, since it is larger than the sum of its proper divisors (3840111).

11520321 is an equidigital number, since it uses as much as digits as its factorization.

11520321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840110.

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

The square root of 11520321 is about 3394.1598371320. The cubic root of 11520321 is about 225.8507446381.

Adding to 11520321 its reverse (12302511), we get a palindrome (23822832).

The spelling of 11520321 in words is "eleven million, five hundred twenty thousand, three hundred twenty-one".