306371040021 has 6 divisors (see below), whose sum is σ = 442535946710. Its totient is φ = 204247360008.

The previous prime is 306371040013. The next prime is 306371040043. The reversal of 306371040021 is 120040173603.

306371040021 is a `hidden beast` number, since 3 + 0 + 637 + 1 + 0 + 4 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 305244095121 + 1126944900 = 552489^2 + 33570^2 .

It is not a de Polignac number, because 306371040021 - 2³ = 306371040013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306371040071) 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 in 5 ways as a sum of consecutive naturals, for example, 17020613326 + ... + 17020613343.

Almost surely, 2^306371040021 is an apocalyptic number.

It is an amenable number.

306371040021 is a deficient number, since it is larger than the sum of its proper divisors (136164906689).

306371040021 is a wasteful number, since it uses less digits than its factorization.

306371040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34041226675 (or 34041226672 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The spelling of 306371040021 in words is "three hundred six billion, three hundred seventy-one million, forty thousand, twenty-one".