11857221 has 12 divisors (see below), whose sum is σ = 17680000. Its totient is φ = 7649640.

The previous prime is 11857217. The next prime is 11857243. The reversal of 11857221 is 12275811.

It is not a de Polignac number, because 11857221 - 2² = 11857217 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 (11857291) 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 11 ways as a sum of consecutive naturals, for example, 20971 + ... + 21528.

Almost surely, 2^11857221 is an apocalyptic number.

It is an amenable number.

11857221 is a deficient number, since it is larger than the sum of its proper divisors (5822779).

11857221 is a wasteful number, since it uses less digits than its factorization.

11857221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42536 (or 42533 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 11857221 is about 3443.4315733001. The cubic root of 11857221 is about 228.0312168707.

The spelling of 11857221 in words is "eleven million, eight hundred fifty-seven thousand, two hundred twenty-one".