268456380221 has 2 divisors, whose sum is σ = 268456380222. Its totient is φ = 268456380220.

The previous prime is 268456380163. The next prime is 268456380281. The reversal of 268456380221 is 122083654862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250261068121 + 18195312100 = 500261^2 + 134890^2 .

It is a cyclic number.

It is not a de Polignac number, because 268456380221 - 2³⁴ = 251276511037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268456380281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134228190110 + 134228190111.

It is an arithmetic number, because the mean of its divisors is an integer number (134228190111).

Almost surely, 2^268456380221 is an apocalyptic number.

It is an amenable number.

268456380221 is a deficient number, since it is larger than the sum of its proper divisors (1).

268456380221 is an equidigital number, since it uses as much as digits as its factorization.

268456380221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 268456380221 in words is "two hundred sixty-eight billion, four hundred fifty-six million, three hundred eighty thousand, two hundred twenty-one".