11504721 has 4 divisors (see below), whose sum is σ = 15339632. Its totient is φ = 7669812.

The previous prime is 11504711. The next prime is 11504729. The reversal of 11504721 is 12740511.

It is a happy number.

11504721 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 not a de Polignac number, because 11504721 - 2⁷ = 11504593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11504729) 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, 1917451 + ... + 1917456.

It is an arithmetic number, because the mean of its divisors is an integer number (3834908).

Almost surely, 2^11504721 is an apocalyptic number.

It is an amenable number.

11504721 is a deficient number, since it is larger than the sum of its proper divisors (3834911).

11504721 is an equidigital number, since it uses as much as digits as its factorization.

11504721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3834910.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 11504721 is about 3391.8609936140. The cubic root of 11504721 is about 225.7487549124.

The spelling of 11504721 in words is "eleven million, five hundred four thousand, seven hundred twenty-one".