221341854097717 has 2 divisors, whose sum is σ = 221341854097718. Its totient is φ = 221341854097716.

The previous prime is 221341854097711. The next prime is 221341854097739. The reversal of 221341854097717 is 717790458143122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209812936376241 + 11528917721476 = 14484921^2 + 3395426^2 .

It is a cyclic number.

It is not a de Polignac number, because 221341854097717 - 2¹⁹ = 221341853573429 is a prime.

It is a super-2 number, since 2×221341854097717² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221341854097711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110670927048858 + 110670927048859.

It is an arithmetic number, because the mean of its divisors is an integer number (110670927048859).

Almost surely, 2^{221341854097717} is an apocalyptic number.

It is an amenable number.

221341854097717 is a deficient number, since it is larger than the sum of its proper divisors (1).

221341854097717 is an equidigital number, since it uses as much as digits as its factorization.

221341854097717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23708160, while the sum is 61.

The spelling of 221341854097717 in words is "two hundred twenty-one trillion, three hundred forty-one billion, eight hundred fifty-four million, ninety-seven thousand, seven hundred seventeen".