11240721 has 24 divisors (see below), whose sum is σ = 17430560. Its totient is φ = 7158888.

The previous prime is 11240707. The next prime is 11240743. The reversal of 11240721 is 12704211.

It is not a de Polignac number, because 11240721 - 2⁹ = 11240209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11240694 and 11240703.

It is not an unprimeable number, because it can be changed into a prime (11240771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13890 + ... + 14676.

Almost surely, 2^11240721 is an apocalyptic number.

It is an amenable number.

11240721 is a deficient number, since it is larger than the sum of its proper divisors (6189839).

11240721 is an equidigital number, since it uses as much as digits as its factorization.

11240721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 11240721 is about 3352.7184492588. The cubic root of 11240721 is about 224.0086160057.

Adding to 11240721 its reverse (12704211), we get a palindrome (23944932).

The spelling of 11240721 in words is "eleven million, two hundred forty thousand, seven hundred twenty-one".