564021 has 12 divisors (see below), whose sum is σ = 843180. Its totient is φ = 362880.

The previous prime is 564017. The next prime is 564041. The reversal of 564021 is 120465.

It is a happy number.

564021 is a `hidden beast` number, since 5 + 640 + 21 = 666.

564021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 324900 + 239121 = 570^2 + 489^2 .

It is not a de Polignac number, because 564021 - 2² = 564017 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 563985 and 564003.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 564021.

It is not an unprimeable number, because it can be changed into a prime (564041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 820 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (70265).

2⁵⁶⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

564021 is a deficient number, since it is larger than the sum of its proper divisors (279159).

564021 is a wasteful number, since it uses less digits than its factorization.

564021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2193 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 564021 is about 751.0133154612. The cubic root of 564021 is about 82.6225176880.

Adding to 564021 its reverse (120465), we get a palindrome (684486).

Subtracting from 564021 its reverse (120465), we obtain a square (443556 = 666²).

The spelling of 564021 in words is "five hundred sixty-four thousand, twenty-one".