304344320021 has 16 divisors (see below), whose sum is σ = 350992656000. Its totient is φ = 258496991808.

The previous prime is 304344320009. The next prime is 304344320029. The reversal of 304344320021 is 120023443403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-304344320021 is a prime.

It is a super-2 number, since 2×304344320021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304344320029) 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, 88811 + ... + 785223.

It is an arithmetic number, because the mean of its divisors is an integer number (21937041000).

Almost surely, 2^304344320021 is an apocalyptic number.

It is an amenable number.

304344320021 is a deficient number, since it is larger than the sum of its proper divisors (46648335979).

304344320021 is a wasteful number, since it uses less digits than its factorization.

304344320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696988.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 304344320021 its reverse (120023443403), we get a palindrome (424367763424).

The spelling of 304344320021 in words is "three hundred four billion, three hundred forty-four million, three hundred twenty thousand, twenty-one".