304424221021 has 6 divisors (see below), whose sum is σ = 311668498590. Its totient is φ = 297344586168.

The previous prime is 304424221019. The next prime is 304424221043. The reversal of 304424221021 is 120122424403.

It can be written as a sum of positive squares in only one way, i.e., 293640436996 + 10783784025 = 541886^2 + 103845^2 .

It is not a de Polignac number, because 304424221021 - 2¹ = 304424221019 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 (304424221081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82319466 + ... + 82323163.

It is an arithmetic number, because the mean of its divisors is an integer number (51944749765).

Almost surely, 2^304424221021 is an apocalyptic number.

It is an amenable number.

304424221021 is a deficient number, since it is larger than the sum of its proper divisors (7244277569).

304424221021 is an equidigital number, since it uses as much as digits as its factorization.

304424221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164642715 (or 164642672 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 304424221021 its reverse (120122424403), we get a palindrome (424546645424).

The spelling of 304424221021 in words is "three hundred four billion, four hundred twenty-four million, two hundred twenty-one thousand, twenty-one".