11304721 has 4 divisors (see below), whose sum is σ = 11610292. Its totient is φ = 10999152.

The previous prime is 11304719. The next prime is 11304737. The reversal of 11304721 is 12740311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12740311 = 71 ⋅179441.

It can be written as a sum of positive squares in 2 ways, for example, as 4730625 + 6574096 = 2175^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 11304721 - 2¹ = 11304719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11304781) 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, 152730 + ... + 152803.

It is an arithmetic number, because the mean of its divisors is an integer number (2902573).

Almost surely, 2^11304721 is an apocalyptic number.

It is an amenable number.

11304721 is a deficient number, since it is larger than the sum of its proper divisors (305571).

11304721 is an equidigital number, since it uses as much as digits as its factorization.

11304721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305570.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 11304721 is about 3362.2493958658. The cubic root of 11304721 is about 224.4329490585.

The spelling of 11304721 in words is "eleven million, three hundred four thousand, seven hundred twenty-one".