11905221 has 16 divisors (see below), whose sum is σ = 16220160. Its totient is φ = 7765680.

The previous prime is 11905217. The next prime is 11905247. The reversal of 11905221 is 12250911.

11905221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11905221 - 2² = 11905217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11905261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45136 + ... + 45398.

It is an arithmetic number, because the mean of its divisors is an integer number (1013760).

Almost surely, 2^11905221 is an apocalyptic number.

It is an amenable number.

11905221 is a deficient number, since it is larger than the sum of its proper divisors (4314939).

11905221 is a wasteful number, since it uses less digits than its factorization.

11905221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 11905221 is about 3450.3943252910. The cubic root of 11905221 is about 228.3385053381.

The spelling of 11905221 in words is "eleven million, nine hundred five thousand, two hundred twenty-one".