2564221 has 8 divisors (see below), whose sum is σ = 2944800. Its totient is φ = 2208240.

The previous prime is 2564207. The next prime is 2564249. The reversal of 2564221 is 1224652.

2564221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2564192 and 2564201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564251) by changing a digit.

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, 5926 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (368100).

2^2564221 is an apocalyptic number.

It is an amenable number.

2564221 is a deficient number, since it is larger than the sum of its proper divisors (380579).

2564221 is a wasteful number, since it uses less digits than its factorization.

2564221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12299.

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

The square root of 2564221 is about 1601.3185192210. The cubic root of 2564221 is about 136.8732199542.

Adding to 2564221 its reverse (1224652), we get a palindrome (3788873).

It can be divided in two parts, 25 and 64221, that added together give a palindrome (64246).

The spelling of 2564221 in words is "two million, five hundred sixty-four thousand, two hundred twenty-one".