305040221 has 4 divisors (see below), whose sum is σ = 305280000. Its totient is φ = 304800444.

The previous prime is 305040143. The next prime is 305040233. The reversal of 305040221 is 122040503.

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 not a de Polignac number, because 305040221 - 2¹⁸ = 304778077 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 305040221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305040271) 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, 117971 + ... + 120528.

It is an arithmetic number, because the mean of its divisors is an integer number (76320000).

Almost surely, 2^305040221 is an apocalyptic number.

It is an amenable number.

305040221 is a deficient number, since it is larger than the sum of its proper divisors (239779).

305040221 is a wasteful number, since it uses less digits than its factorization.

305040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239778.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 305040221 is about 17465.4006824922. The cubic root of 305040221 is about 673.1611375233.

Adding to 305040221 its reverse (122040503), we get a palindrome (427080724).

The spelling of 305040221 in words is "three hundred five million, forty thousand, two hundred twenty-one".