11221257 has 4 divisors (see below), whose sum is σ = 14961680. Its totient is φ = 7480836.

The previous prime is 11221253. The next prime is 11221283. The reversal of 11221257 is 75212211.

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 11221257 - 2² = 11221253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1870207 + ... + 1870212.

It is an arithmetic number, because the mean of its divisors is an integer number (3740420).

Almost surely, 2^11221257 is an apocalyptic number.

It is an amenable number.

11221257 is a deficient number, since it is larger than the sum of its proper divisors (3740423).

11221257 is an equidigital number, since it uses as much as digits as its factorization.

11221257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740422.

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

The square root of 11221257 is about 3349.8144724746. The cubic root of 11221257 is about 223.8792464062.

Adding to 11221257 its reverse (75212211), we get a palindrome (86433468).

The spelling of 11221257 in words is "eleven million, two hundred twenty-one thousand, two hundred fifty-seven".