221362722121 has 2 divisors, whose sum is σ = 221362722122. Its totient is φ = 221362722120.

The previous prime is 221362722029. The next prime is 221362722131. The reversal of 221362722121 is 121227263122.

221362722121 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., 148062574521 + 73300147600 = 384789^2 + 270740^2 .

It is a cyclic number.

It is not a de Polignac number, because 221362722121 - 2³³ = 212772787529 is a prime.

It is not a weakly prime, because it can be changed into another prime (221362722131) 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, 110681361060 + 110681361061.

It is an arithmetic number, because the mean of its divisors is an integer number (110681361061).

Almost surely, 2^221362722121 is an apocalyptic number.

It is an amenable number.

221362722121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221362722121 is an equidigital number, since it uses as much as digits as its factorization.

221362722121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

Adding to 221362722121 its reverse (121227263122), we get a palindrome (342589985243).

The spelling of 221362722121 in words is "two hundred twenty-one billion, three hundred sixty-two million, seven hundred twenty-two thousand, one hundred twenty-one".