564242021 has 8 divisors (see below), whose sum is σ = 649771584. Its totient is φ = 479943360.

The previous prime is 564242017. The next prime is 564242047. The reversal of 564242021 is 120242465.

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 564242021 - 2² = 564242017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564242321) 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 7 ways as a sum of consecutive naturals, for example, 306740 + ... + 308573.

It is an arithmetic number, because the mean of its divisors is an integer number (81221448).

Almost surely, 2^564242021 is an apocalyptic number.

It is an amenable number.

564242021 is a deficient number, since it is larger than the sum of its proper divisors (85529563).

564242021 is a wasteful number, since it uses less digits than its factorization.

564242021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615451.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 564242021 is about 23753.7790888103. The cubic root of 564242021 is about 826.3330861401. Note that the first 3 decimals are identical.

Adding to 564242021 its reverse (120242465), we get a palindrome (684484486).

The spelling of 564242021 in words is "five hundred sixty-four million, two hundred forty-two thousand, twenty-one".