68041938221 has 2 divisors, whose sum is σ = 68041938222. Its totient is φ = 68041938220.

The previous prime is 68041938193. The next prime is 68041938227. The reversal of 68041938221 is 12283914086.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36284916196 + 31757022025 = 190486^2 + 178205^2 .

It is a cyclic number.

It is not a de Polignac number, because 68041938221 - 2¹⁴ = 68041921837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68041938227) 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, 34020969110 + 34020969111.

It is an arithmetic number, because the mean of its divisors is an integer number (34020969111).

Almost surely, 2^68041938221 is an apocalyptic number.

It is an amenable number.

68041938221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68041938221 is an equidigital number, since it uses as much as digits as its factorization.

68041938221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 68041938221 in words is "sixty-eight billion, forty-one million, nine hundred thirty-eight thousand, two hundred twenty-one".