305240221 has 16 divisors (see below), whose sum is σ = 361912320. Its totient is φ = 253782720.

The previous prime is 305240209. The next prime is 305240239. The reversal of 305240221 is 122042503.

It is a cyclic number.

It is not a de Polignac number, because 305240221 - 2⁷ = 305240093 is a prime.

It is a super-2 number, since 2×305240221² = 186343185032257682, which contains 22 as substring.

305240221 is a modest number, since divided by 40221 gives 3052 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305249221) 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, 5796 + ... + 25378.

It is an arithmetic number, because the mean of its divisors is an integer number (22619520).

Almost surely, 2^305240221 is an apocalyptic number.

It is an amenable number.

305240221 is a deficient number, since it is larger than the sum of its proper divisors (56672099).

305240221 is a wasteful number, since it uses less digits than its factorization.

305240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19716.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 305240221 is about 17471.1253501313. The cubic root of 305240221 is about 673.3082250274.

Adding to 305240221 its reverse (122042503), we get a palindrome (427282724).

The spelling of 305240221 in words is "three hundred five million, two hundred forty thousand, two hundred twenty-one".