2221646 has 16 divisors (see below), whose sum is σ = 3932160. Its totient is φ = 921240.

The previous prime is 2221633. The next prime is 2221657. The reversal of 2221646 is 6461222.

2221646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2126 + ... + 2993.

It is an arithmetic number, because the mean of its divisors is an integer number (245760).

2^2221646 is an apocalyptic number.

2221646 is a deficient number, since it is larger than the sum of its proper divisors (1710514).

2221646 is a wasteful number, since it uses less digits than its factorization.

2221646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159.

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

The square root of 2221646 is about 1490.5187016606. The cubic root of 2221646 is about 130.4843078953.

Adding to 2221646 its reverse (6461222), we get a palindrome (8682868).

The spelling of 2221646 in words is "two million, two hundred twenty-one thousand, six hundred forty-six".