268343021 has 4 divisors (see below), whose sum is σ = 270717852. Its totient is φ = 265968192.

The previous prime is 268342979. The next prime is 268343039. The reversal of 268343021 is 120343862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120343862 = 2 ⋅60171931.

It can be written as a sum of positive squares in 2 ways, for example, as 150945796 + 117397225 = 12286^2 + 10835^2 .

It is a cyclic number.

It is not a de Polignac number, because 268343021 - 2⁶ = 268342957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268343041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187246 + ... + 1187471.

It is an arithmetic number, because the mean of its divisors is an integer number (67679463).

Almost surely, 2^268343021 is an apocalyptic number.

It is an amenable number.

268343021 is a deficient number, since it is larger than the sum of its proper divisors (2374831).

268343021 is a wasteful number, since it uses less digits than its factorization.

268343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374830.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 268343021 is about 16381.1788647826. The cubic root of 268343021 is about 645.0055252616.

Adding to 268343021 its reverse (120343862), we get a palindrome (388686883).

The spelling of 268343021 in words is "two hundred sixty-eight million, three hundred forty-three thousand, twenty-one".