275243221 has 16 divisors (see below), whose sum is σ = 303730560. Its totient is φ = 247353280.

The previous prime is 275243219. The next prime is 275243239. The reversal of 275243221 is 122342572.

It is a cyclic number.

It is not a de Polignac number, because 275243221 - 2¹ = 275243219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 275243221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275243251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493875 + ... + 494431.

It is an arithmetic number, because the mean of its divisors is an integer number (18983160).

Almost surely, 2^275243221 is an apocalyptic number.

It is an amenable number.

275243221 is a deficient number, since it is larger than the sum of its proper divisors (28487339).

275243221 is a wasteful number, since it uses less digits than its factorization.

275243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004.

The product of its digits is 6720, while the sum is 28.

The square root of 275243221 is about 16590.4557200820. The cubic root of 275243221 is about 650.4873827829.

Adding to 275243221 its reverse (122342572), we get a palindrome (397585793).

The spelling of 275243221 in words is "two hundred seventy-five million, two hundred forty-three thousand, two hundred twenty-one".