568821421 has 4 divisors (see below), whose sum is σ = 650081632. Its totient is φ = 487561212.

The previous prime is 568821403. The next prime is 568821427. The reversal of 568821421 is 124128865.

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 568821421 - 2⁵ = 568821389 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 (568821427) 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, 40630095 + ... + 40630108.

It is an arithmetic number, because the mean of its divisors is an integer number (162520408).

Almost surely, 2^568821421 is an apocalyptic number.

It is an amenable number.

568821421 is a deficient number, since it is larger than the sum of its proper divisors (81260211).

568821421 is an equidigital number, since it uses as much as digits as its factorization.

568821421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81260210.

The product of its digits is 30720, while the sum is 37.

The square root of 568821421 is about 23849.9773794442. The cubic root of 568821421 is about 828.5625776233.

The spelling of 568821421 in words is "five hundred sixty-eight million, eight hundred twenty-one thousand, four hundred twenty-one".