304221121 has 4 divisors (see below), whose sum is σ = 304522452. Its totient is φ = 303919792.

The previous prime is 304221119. The next prime is 304221131. The reversal of 304221121 is 121122403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121122403 = 73 ⋅1659211.

It can be written as a sum of positive squares in 2 ways, for example, as 207025 + 304014096 = 455^2 + 17436^2 .

It is a cyclic number.

It is not a de Polignac number, because 304221121 - 2¹ = 304221119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 304221095 and 304221104.

It is not an unprimeable number, because it can be changed into a prime (304221131) 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, 149146 + ... + 151171.

It is an arithmetic number, because the mean of its divisors is an integer number (76130613).

Almost surely, 2^304221121 is an apocalyptic number.

It is an amenable number.

304221121 is a deficient number, since it is larger than the sum of its proper divisors (301331).

304221121 is a wasteful number, since it uses less digits than its factorization.

304221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301330.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 304221121 is about 17441.9357010625. The cubic root of 304221121 is about 672.5580689022.

Adding to 304221121 its reverse (121122403), we get a palindrome (425343524).

The spelling of 304221121 in words is "three hundred four million, two hundred twenty-one thousand, one hundred twenty-one".