268344244407221 has 2 divisors, whose sum is σ = 268344244407222. Its totient is φ = 268344244407220.

The previous prime is 268344244407121. The next prime is 268344244407233. The reversal of 268344244407221 is 122704442443862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256678529016100 + 11665715391121 = 16021190^2 + 3415511^2 .

It is a cyclic number.

It is not a de Polignac number, because 268344244407221 - 2¹⁸ = 268344244145077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268344244407121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134172122203610 + 134172122203611.

It is an arithmetic number, because the mean of its divisors is an integer number (134172122203611).

Almost surely, 2^{268344244407221} is an apocalyptic number.

It is an amenable number.

268344244407221 is a deficient number, since it is larger than the sum of its proper divisors (1).

268344244407221 is an equidigital number, since it uses as much as digits as its factorization.

268344244407221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16515072, while the sum is 53.

The spelling of 268344244407221 in words is "two hundred sixty-eight trillion, three hundred forty-four billion, two hundred forty-four million, four hundred seven thousand, two hundred twenty-one".