268056221 has 4 divisors (see below), whose sum is σ = 283824252. Its totient is φ = 252288192.

The previous prime is 268056167. The next prime is 268056223. The reversal of 268056221 is 122650862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122650862 = 2 ⋅61325431.

It can be written as a sum of positive squares in 2 ways, for example, as 138415225 + 129640996 = 11765^2 + 11386^2 .

It is a cyclic number.

It is not a de Polignac number, because 268056221 - 2¹⁸ = 267794077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268056223) 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 in 3 ways as a sum of consecutive naturals, for example, 7883990 + ... + 7884023.

It is an arithmetic number, because the mean of its divisors is an integer number (70956063).

Almost surely, 2^268056221 is an apocalyptic number.

It is an amenable number.

268056221 is a deficient number, since it is larger than the sum of its proper divisors (15768031).

268056221 is a wasteful number, since it uses less digits than its factorization.

268056221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15768030.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 268056221 is about 16372.4225757827. The cubic root of 268056221 is about 644.7756534023.

The spelling of 268056221 in words is "two hundred sixty-eight million, fifty-six thousand, two hundred twenty-one".