11457221 has 4 divisors (see below), whose sum is σ = 11723712. Its totient is φ = 11190732.

The previous prime is 11457181. The next prime is 11457223. The reversal of 11457221 is 12275411.

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 11457221 - 2⁶ = 11457157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11457223) 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, 133181 + ... + 133266.

It is an arithmetic number, because the mean of its divisors is an integer number (2930928).

Almost surely, 2^11457221 is an apocalyptic number.

It is an amenable number.

11457221 is a deficient number, since it is larger than the sum of its proper divisors (266491).

11457221 is an equidigital number, since it uses as much as digits as its factorization.

11457221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266490.

The product of its digits is 560, while the sum is 23.

The square root of 11457221 is about 3384.8516954218. The cubic root of 11457221 is about 225.4376403887.

The spelling of 11457221 in words is "eleven million, four hundred fifty-seven thousand, two hundred twenty-one".