268641221 has 4 divisors (see below), whose sum is σ = 269253600. Its totient is φ = 268028844.

The previous prime is 268641193. The next prime is 268641223. The reversal of 268641221 is 122146862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268641221 is a prime.

It is a super-3 number, since 3×268641221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268641223) 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, 305531 + ... + 306408.

It is an arithmetic number, because the mean of its divisors is an integer number (67313400).

Almost surely, 2^268641221 is an apocalyptic number.

It is an amenable number.

268641221 is a deficient number, since it is larger than the sum of its proper divisors (612379).

268641221 is an equidigital number, since it uses as much as digits as its factorization.

268641221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612378.

The product of its digits is 9216, while the sum is 32.

The square root of 268641221 is about 16390.2782465704. The cubic root of 268641221 is about 645.2443606694.

It can be divided in two parts, 268641 and 221, that added together give a palindrome (268862).

The spelling of 268641221 in words is "two hundred sixty-eight million, six hundred forty-one thousand, two hundred twenty-one".