306442310221 has 4 divisors (see below), whose sum is σ = 306449609472. Its totient is φ = 306435010972.

The previous prime is 306442310219. The next prime is 306442310357. The reversal of 306442310221 is 122013244603.

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.

It is a cyclic number.

It is not a de Polignac number, because 306442310221 - 2¹ = 306442310219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 306442310221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306442310021) 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, 3586285 + ... + 3670738.

It is an arithmetic number, because the mean of its divisors is an integer number (76612402368).

Almost surely, 2^306442310221 is an apocalyptic number.

It is an amenable number.

306442310221 is a deficient number, since it is larger than the sum of its proper divisors (7299251).

306442310221 is an equidigital number, since it uses as much as digits as its factorization.

306442310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299250.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 306442310221 its reverse (122013244603), we get a palindrome (428455554824).

The spelling of 306442310221 in words is "three hundred six billion, four hundred forty-two million, three hundred ten thousand, two hundred twenty-one".