11757221 has 4 divisors (see below), whose sum is σ = 13436832. Its totient is φ = 10077612.

The previous prime is 11757173. The next prime is 11757223. The reversal of 11757221 is 12275711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12275711 = 7 ⋅1753673.

It is a cyclic number.

It is not a de Polignac number, because 11757221 - 2¹⁴ = 11740837 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 (11757223) 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, 839795 + ... + 839808.

It is an arithmetic number, because the mean of its divisors is an integer number (3359208).

Almost surely, 2^11757221 is an apocalyptic number.

It is an amenable number.

11757221 is a deficient number, since it is larger than the sum of its proper divisors (1679611).

11757221 is an equidigital number, since it uses as much as digits as its factorization.

11757221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679610.

The product of its digits is 980, while the sum is 26.

The square root of 11757221 is about 3428.8804295280. The cubic root of 11757221 is about 227.3883588609.

The spelling of 11757221 in words is "eleven million, seven hundred fifty-seven thousand, two hundred twenty-one".