2211564 has 48 divisors (see below), whose sum is σ = 5630688. Its totient is φ = 672768.

The previous prime is 2211563. The next prime is 2211577. The reversal of 2211564 is 4651122.

It is a self number, because there is not a number n which added to its sum of digits gives 2211564.

It is not an unprimeable number, because it can be changed into a prime (2211563) 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 in 15 ways as a sum of consecutive naturals, for example, 7402 + ... + 7694.

It is an arithmetic number, because the mean of its divisors is an integer number (117306).

2^2211564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2211564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2815344).

2211564 is an abundant number, since it is smaller than the sum of its proper divisors (3419124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2211564 is a wasteful number, since it uses less digits than its factorization.

2211564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 352 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 2211564 is about 1487.1328118228. The cubic root of 2211564 is about 130.2866259610.

Adding to 2211564 its reverse (4651122), we get a palindrome (6862686).

It can be divided in two parts, 2211 and 564, that added together give a triangular number (2775 = T₇₄).

The spelling of 2211564 in words is "two million, two hundred eleven thousand, five hundred sixty-four".