563121621 has 12 divisors (see below), whose sum is σ = 815733100. Its totient is φ = 374336640.

The previous prime is 563121599. The next prime is 563121631. The reversal of 563121621 is 126121365.

563121621 is a `hidden beast` number, since 5 + 6 + 31 + 2 + 1 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 447322500 + 115799121 = 21150^2 + 10761^2 .

It is not a de Polignac number, because 563121621 - 2⁶ = 563121557 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 (563121631) 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 11 ways as a sum of consecutive naturals, for example, 86500 + ... + 92781.

Almost surely, 2^563121621 is an apocalyptic number.

It is an amenable number.

563121621 is a deficient number, since it is larger than the sum of its proper divisors (252611479).

563121621 is a wasteful number, since it uses less digits than its factorization.

563121621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179636 (or 179633 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 563121621 is about 23730.1837540294. The cubic root of 563121621 is about 825.7857813628.

Adding to 563121621 its reverse (126121365), we get a palindrome (689242986).

The spelling of 563121621 in words is "five hundred sixty-three million, one hundred twenty-one thousand, six hundred twenty-one".