11257221 has 4 divisors (see below), whose sum is σ = 15009632. Its totient is φ = 7504812.

The previous prime is 11257217. The next prime is 11257229. The reversal of 11257221 is 12275211.

11257221 is digitally balanced in base 2, because in such base 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 11257221 - 2² = 11257217 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 (11257229) 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, 1876201 + ... + 1876206.

It is an arithmetic number, because the mean of its divisors is an integer number (3752408).

Almost surely, 2^11257221 is an apocalyptic number.

It is an amenable number.

11257221 is a deficient number, since it is larger than the sum of its proper divisors (3752411).

11257221 is an equidigital number, since it uses as much as digits as its factorization.

11257221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752410.

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

The square root of 11257221 is about 3355.1782366962. The cubic root of 11257221 is about 224.1181681464.

The spelling of 11257221 in words is "eleven million, two hundred fifty-seven thousand, two hundred twenty-one".