2221564 has 6 divisors (see below), whose sum is σ = 3887744. Its totient is φ = 1110780.

The previous prime is 2221523. The next prime is 2221567. The reversal of 2221564 is 4651222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277692 + ... + 277699.

2^2221564 is an apocalyptic number.

It is an amenable number.

2221564 is a deficient number, since it is larger than the sum of its proper divisors (1666180).

2221564 is a wasteful number, since it uses less digits than its factorization.

2221564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555395 (or 555393 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 2221564 is about 1490.4911942041. The cubic root of 2221564 is about 130.4827025023.

Adding to 2221564 its reverse (4651222), we get a palindrome (6872786).

The spelling of 2221564 in words is "two million, two hundred twenty-one thousand, five hundred sixty-four".