563921221 has 4 divisors (see below), whose sum is σ = 577035712. Its totient is φ = 550806732.

The previous prime is 563921209. The next prime is 563921243. The reversal of 563921221 is 122129365.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 563921221 - 2¹³ = 563913029 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 (563921321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6557181 + ... + 6557266.

It is an arithmetic number, because the mean of its divisors is an integer number (144258928).

Almost surely, 2^563921221 is an apocalyptic number.

It is an amenable number.

563921221 is a deficient number, since it is larger than the sum of its proper divisors (13114491).

563921221 is a wasteful number, since it uses less digits than its factorization.

563921221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13114490.

The product of its digits is 6480, while the sum is 31.

The square root of 563921221 is about 23747.0255189992. The cubic root of 563921221 is about 826.1764524624.

The spelling of 563921221 in words is "five hundred sixty-three million, nine hundred twenty-one thousand, two hundred twenty-one".