266333221 has 24 divisors (see below), whose sum is σ = 335849472. Its totient is φ = 206738400.

The previous prime is 266333219. The next prime is 266333227. The reversal of 266333221 is 122333662.

It is not a de Polignac number, because 266333221 - 2¹ = 266333219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 266333221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266333227) 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 23 ways as a sum of consecutive naturals, for example, 323991 + ... + 324811.

It is an arithmetic number, because the mean of its divisors is an integer number (13993728).

Almost surely, 2^266333221 is an apocalyptic number.

It is an amenable number.

266333221 is a deficient number, since it is larger than the sum of its proper divisors (69516251).

266333221 is a wasteful number, since it uses less digits than its factorization.

266333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1222 counting only the distinct ones).

The product of its digits is 7776, while the sum is 28.

The square root of 266333221 is about 16319.7187782143. The cubic root of 266333221 is about 643.3911959613.

Adding to 266333221 its reverse (122333662), we get a palindrome (388666883).

The spelling of 266333221 in words is "two hundred sixty-six million, three hundred thirty-three thousand, two hundred twenty-one".