2221664 has 12 divisors (see below), whose sum is σ = 4373964. Its totient is φ = 1110816.

The previous prime is 2221657. The next prime is 2221669. The reversal of 2221664 is 4661222.

2221664 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34682 + ... + 34745.

It is an arithmetic number, because the mean of its divisors is an integer number (364497).

2^2221664 is an apocalyptic number.

It is an amenable number.

2221664 is a deficient number, since it is larger than the sum of its proper divisors (2152300).

2221664 is an equidigital number, since it uses as much as digits as its factorization.

2221664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69437 (or 69429 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 2221664 is about 1490.5247398148. The cubic root of 2221664 is about 130.4846602933.

Adding to 2221664 its reverse (4661222), we get a palindrome (6882886).

The spelling of 2221664 in words is "two million, two hundred twenty-one thousand, six hundred sixty-four".