2564630221 has 8 divisors (see below), whose sum is σ = 2607168960. Its totient is φ = 2522216928.

The previous prime is 2564630213. The next prime is 2564630227. The reversal of 2564630221 is 1220364652.

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

It is a cyclic number.

It is not a de Polignac number, because 2564630221 - 2³ = 2564630213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564630227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10320 + ... + 72358.

It is an arithmetic number, because the mean of its divisors is an integer number (325896120).

Almost surely, 2^2564630221 is an apocalyptic number.

It is an amenable number.

2564630221 is a deficient number, since it is larger than the sum of its proper divisors (42538739).

2564630221 is an equidigital number, since it uses as much as digits as its factorization.

2564630221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62723.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2564630221 is about 50642.1782805598. The cubic root of 2564630221 is about 1368.8050071205.

Adding to 2564630221 its reverse (1220364652), we get a palindrome (3784994873).

The spelling of 2564630221 in words is "two billion, five hundred sixty-four million, six hundred thirty thousand, two hundred twenty-one".