305338221 has 16 divisors (see below), whose sum is σ = 452980800. Its totient is φ = 203276304.

The previous prime is 305338217. The next prime is 305338223. The reversal of 305338221 is 122833503.

305338221 is a `hidden beast` number, since 30 + 533 + 82 + 21 = 666.

It is not a de Polignac number, because 305338221 - 2² = 305338217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305338223) 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, 12970 + ... + 27908.

It is an arithmetic number, because the mean of its divisors is an integer number (28311300).

Almost surely, 2^305338221 is an apocalyptic number.

It is an amenable number.

305338221 is a deficient number, since it is larger than the sum of its proper divisors (147642579).

305338221 is a wasteful number, since it uses less digits than its factorization.

305338221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15705 (or 15699 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 305338221 is about 17473.9297526344. The cubic root of 305338221 is about 673.3802744508.

The spelling of 305338221 in words is "three hundred five million, three hundred thirty-eight thousand, two hundred twenty-one".