268268267221 has 2 divisors, whose sum is σ = 268268267222. Its totient is φ = 268268267220.

The previous prime is 268268267171. The next prime is 268268267243. The reversal of 268268267221 is 122762862862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265803144721 + 2465122500 = 515561^2 + 49650^2 .

It is a cyclic number.

It is not a de Polignac number, because 268268267221 - 2¹¹ = 268268265173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268268268221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134134133610 + 134134133611.

It is an arithmetic number, because the mean of its divisors is an integer number (134134133611).

Almost surely, 2^268268267221 is an apocalyptic number.

It is an amenable number.

268268267221 is a deficient number, since it is larger than the sum of its proper divisors (1).

268268267221 is an equidigital number, since it uses as much as digits as its factorization.

268268267221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 52.

The spelling of 268268267221 in words is "two hundred sixty-eight billion, two hundred sixty-eight million, two hundred sixty-seven thousand, two hundred twenty-one".