12211664 has 20 divisors (see below), whose sum is σ = 23717604. Its totient is φ = 6091008.

The previous prime is 12211657. The next prime is 12211669. The reversal of 12211664 is 46611221.

12211664 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 2 ways, for example, as 4032064 + 8179600 = 2008^2 + 2860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9254 + ... + 10490.

Almost surely, 2^12211664 is an apocalyptic number.

It is an amenable number.

12211664 is a deficient number, since it is larger than the sum of its proper divisors (11505940).

12211664 is a wasteful number, since it uses less digits than its factorization.

12211664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862 (or 1856 counting only the distinct ones).

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

The square root of 12211664 is about 3494.5191371632. The cubic root of 12211664 is about 230.2810929970.

Adding to 12211664 its reverse (46611221), we get a palindrome (58822885).

The spelling of 12211664 in words is "twelve million, two hundred eleven thousand, six hundred sixty-four".