11646221 has 6 divisors (see below), whose sum is σ = 12291822. Its totient is φ = 11032920.

The previous prime is 11646203. The next prime is 11646223. The reversal of 11646221 is 12264611.

11646221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7590025 + 4056196 = 2755^2 + 2014^2 .

It is not a de Polignac number, because 11646221 - 2¹⁰ = 11645197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11646223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15770 + ... + 16491.

It is an arithmetic number, because the mean of its divisors is an integer number (2048637).

Almost surely, 2^11646221 is an apocalyptic number.

It is an amenable number.

11646221 is a deficient number, since it is larger than the sum of its proper divisors (645601).

11646221 is an equidigital number, since it uses as much as digits as its factorization.

11646221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32299 (or 32280 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 11646221 is about 3412.6560037601. The cubic root of 11646221 is about 226.6705033472.

The spelling of 11646221 in words is "eleven million, six hundred forty-six thousand, two hundred twenty-one".