221313102161 has 2 divisors, whose sum is σ = 221313102162. Its totient is φ = 221313102160.

The previous prime is 221313102097. The next prime is 221313102217. The reversal of 221313102161 is 161201313122.

221313102161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203012423761 + 18300678400 = 450569^2 + 135280^2 .

It is a cyclic number.

It is not a de Polignac number, because 221313102161 - 2⁶ = 221313102097 is a prime.

It is not a weakly prime, because it can be changed into another prime (221313152161) 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, 110656551080 + 110656551081.

It is an arithmetic number, because the mean of its divisors is an integer number (110656551081).

Almost surely, 2^221313102161 is an apocalyptic number.

It is an amenable number.

221313102161 is a deficient number, since it is larger than the sum of its proper divisors (1).

221313102161 is an equidigital number, since it uses as much as digits as its factorization.

221313102161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 221313102161 its reverse (161201313122), we get a palindrome (382514415283).

The spelling of 221313102161 in words is "two hundred twenty-one billion, three hundred thirteen million, one hundred two thousand, one hundred sixty-one".