566221421 has 2 divisors, whose sum is σ = 566221422. Its totient is φ = 566221420.

The previous prime is 566221399. The next prime is 566221457. The reversal of 566221421 is 124122665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469198921 + 97022500 = 21661^2 + 9850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566221421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566221121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283110710 + 283110711.

It is an arithmetic number, because the mean of its divisors is an integer number (283110711).

Almost surely, 2^566221421 is an apocalyptic number.

It is an amenable number.

566221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

566221421 is an equidigital number, since it uses as much as digits as its factorization.

566221421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 566221421 is about 23795.4075611241. The cubic root of 566221421 is about 827.2982362698.

The spelling of 566221421 in words is "five hundred sixty-six million, two hundred twenty-one thousand, four hundred twenty-one".