305431242352121 has 4 divisors (see below), whose sum is σ = 308233363841700. Its totient is φ = 302629120862544.

The previous prime is 305431242352109. The next prime is 305431242352133. The reversal of 305431242352121 is 121253242134503.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (305431242352109) and next prime (305431242352133).

It can be written as a sum of positive squares in 2 ways, for example, as 215057414906896 + 90373827445225 = 14664836^2 + 9506515^2 .

It is a cyclic number.

It is not a de Polignac number, because 305431242352121 - 2⁴² = 301033195841017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (305431242352151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401060744626 + ... + 1401060744843.

It is an arithmetic number, because the mean of its divisors is an integer number (77058340960425).

Almost surely, 2^{305431242352121} is an apocalyptic number.

It is an amenable number.

305431242352121 is a deficient number, since it is larger than the sum of its proper divisors (2802121489579).

305431242352121 is a wasteful number, since it uses less digits than its factorization.

305431242352121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802121489578.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 305431242352121 its reverse (121253242134503), we get a palindrome (426684484486624).

The spelling of 305431242352121 in words is "three hundred five trillion, four hundred thirty-one billion, two hundred forty-two million, three hundred fifty-two thousand, one hundred twenty-one".