306213421244321 has 4 divisors (see below), whose sum is σ = 306213460896000. Its totient is φ = 306213381592644.

The previous prime is 306213421244279. The next prime is 306213421244327. The reversal of 306213421244321 is 123442124312603.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 306213421244321 - 2¹⁸ = 306213420982177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (306213421244327) 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, 4066121 + ... + 25079078.

It is an arithmetic number, because the mean of its divisors is an integer number (76553365224000).

Almost surely, 2^{306213421244321} is an apocalyptic number.

It is an amenable number.

306213421244321 is a deficient number, since it is larger than the sum of its proper divisors (39651679).

306213421244321 is a wasteful number, since it uses less digits than its factorization.

306213421244321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39651678.

The product of its (nonzero) digits is 165888, while the sum is 38.

Adding to 306213421244321 its reverse (123442124312603), we get a palindrome (429655545556924).

The spelling of 306213421244321 in words is "three hundred six trillion, two hundred thirteen billion, four hundred twenty-one million, two hundred forty-four thousand, three hundred twenty-one".