305042421 has 4 divisors (see below), whose sum is σ = 406723232. Its totient is φ = 203361612.

The previous prime is 305042417. The next prime is 305042453. The reversal of 305042421 is 124240503.

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 not a de Polignac number, because 305042421 - 2² = 305042417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305049421) 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, 50840401 + ... + 50840406.

It is an arithmetic number, because the mean of its divisors is an integer number (101680808).

Almost surely, 2^305042421 is an apocalyptic number.

It is an amenable number.

305042421 is a deficient number, since it is larger than the sum of its proper divisors (101680811).

305042421 is a wasteful number, since it uses less digits than its factorization.

305042421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101680810.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 305042421 is about 17465.4636640428. The cubic root of 305042421 is about 673.1627558355.

Adding to 305042421 its reverse (124240503), we get a palindrome (429282924).

The spelling of 305042421 in words is "three hundred five million, forty-two thousand, four hundred twenty-one".