305243243421 has 4 divisors (see below), whose sum is σ = 406990991232. Its totient is φ = 203495495612.

The previous prime is 305243243369. The next prime is 305243243447. The reversal of 305243243421 is 124342342503.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124342342503 = 3 ⋅41447447501.

It is a cyclic number.

It is not a de Polignac number, because 305243243421 - 2⁷ = 305243243293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305243243491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50873873901 + ... + 50873873906.

It is an arithmetic number, because the mean of its divisors is an integer number (101747747808).

Almost surely, 2^305243243421 is an apocalyptic number.

It is an amenable number.

305243243421 is a deficient number, since it is larger than the sum of its proper divisors (101747747811).

305243243421 is a wasteful number, since it uses less digits than its factorization.

305243243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101747747810.

The product of its (nonzero) digits is 69120, while the sum is 33.

Adding to 305243243421 its reverse (124342342503), we get a palindrome (429585585924).

The spelling of 305243243421 in words is "three hundred five billion, two hundred forty-three million, two hundred forty-three thousand, four hundred twenty-one".