305021120000021 has 2 divisors, whose sum is σ = 305021120000022. Its totient is φ = 305021120000020.

The previous prime is 305021119999969. The next prime is 305021120000071. The reversal of 305021120000021 is 120000021120503.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241389388697521 + 63631731302500 = 15536711^2 + 7976950^2 .

It is a cyclic number.

It is not a de Polignac number, because 305021120000021 - 2⁶ = 305021119999957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305021120000071) 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 as a sum of consecutive naturals, namely, 152510560000010 + 152510560000011.

It is an arithmetic number, because the mean of its divisors is an integer number (152510560000011).

Almost surely, 2^{305021120000021} is an apocalyptic number.

It is an amenable number.

305021120000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

305021120000021 is an equidigital number, since it uses as much as digits as its factorization.

305021120000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 305021120000021 its reverse (120000021120503), we get a palindrome (425021141120524).

The spelling of 305021120000021 in words is "three hundred five trillion, twenty-one billion, one hundred twenty million, twenty-one", and thus it is an aban number.