268513021 has 16 divisors (see below), whose sum is σ = 317399040. Its totient is φ = 222384240.

The previous prime is 268513009. The next prime is 268513031. The reversal of 268513021 is 120315862.

It is a cyclic number.

It is not a de Polignac number, because 268513021 - 2¹⁹ = 267988733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268513031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20826 + ... + 31156.

It is an arithmetic number, because the mean of its divisors is an integer number (19837440).

Almost surely, 2^268513021 is an apocalyptic number.

It is an amenable number.

268513021 is a deficient number, since it is larger than the sum of its proper divisors (48886019).

268513021 is a wasteful number, since it uses less digits than its factorization.

268513021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10464.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 268513021 is about 16386.3669249776. The cubic root of 268513021 is about 645.1417039379.

Adding to 268513021 its reverse (120315862), we get a palindrome (388828883).

The spelling of 268513021 in words is "two hundred sixty-eight million, five hundred thirteen thousand, twenty-one".