4221564 has 12 divisors (see below), whose sum is σ = 9850344. Its totient is φ = 1407184.

The previous prime is 4221563. The next prime is 4221571. The reversal of 4221564 is 4651224.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221563) 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, 175887 + ... + 175910.

It is an arithmetic number, because the mean of its divisors is an integer number (820862).

Almost surely, 2^4221564 is an apocalyptic number.

It is an amenable number.

4221564 is an abundant number, since it is smaller than the sum of its proper divisors (5628780).

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

4221564 is a wasteful number, since it uses less digits than its factorization.

4221564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351804 (or 351802 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 4221564 is about 2054.6444947971. The cubic root of 4221564 is about 161.6185201628.

Adding to 4221564 its reverse (4651224), we get a palindrome (8872788).

The spelling of 4221564 in words is "four million, two hundred twenty-one thousand, five hundred sixty-four".