306456040021 has 2 divisors, whose sum is σ = 306456040022. Its totient is φ = 306456040020.

The previous prime is 306456039983. The next prime is 306456040063. The reversal of 306456040021 is 120040654603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192238402500 + 114217637521 = 438450^2 + 337961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-306456040021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306456040091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153228020010 + 153228020011.

It is an arithmetic number, because the mean of its divisors is an integer number (153228020011).

Almost surely, 2^306456040021 is an apocalyptic number.

It is an amenable number.

306456040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

306456040021 is an equidigital number, since it uses as much as digits as its factorization.

306456040021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 306456040021 its reverse (120040654603), we get a palindrome (426496694624).

The spelling of 306456040021 in words is "three hundred six billion, four hundred fifty-six million, forty thousand, twenty-one".