304320121221 has 16 divisors (see below), whose sum is σ = 415677144960. Its totient is φ = 197922074880.

The previous prime is 304320121199. The next prime is 304320121279. The reversal of 304320121221 is 122121023403.

It is not a de Polignac number, because 304320121221 - 2⁷ = 304320121093 is a prime.

It is a super-2 number, since 2×304320121221² (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 (304300121221) 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, 3139560 + ... + 3235038.

It is an arithmetic number, because the mean of its divisors is an integer number (25979821560).

Almost surely, 2^304320121221 is an apocalyptic number.

It is an amenable number.

304320121221 is a deficient number, since it is larger than the sum of its proper divisors (111357023739).

304320121221 is a wasteful number, since it uses less digits than its factorization.

304320121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121436.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 304320121221 its reverse (122121023403), we get a palindrome (426441144624).

The spelling of 304320121221 in words is "three hundred four billion, three hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".