18023066021 has 2 divisors, whose sum is σ = 18023066022. Its totient is φ = 18023066020.

The previous prime is 18023066011. The next prime is 18023066051. The reversal of 18023066021 is 12066032081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9966028900 + 8057037121 = 99830^2 + 89761^2 .

It is a cyclic number.

It is not a de Polignac number, because 18023066021 - 2¹⁴ = 18023049637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18023066011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9011533010 + 9011533011.

It is an arithmetic number, because the mean of its divisors is an integer number (9011533011).

Almost surely, 2^18023066021 is an apocalyptic number.

It is an amenable number.

18023066021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18023066021 is an equidigital number, since it uses as much as digits as its factorization.

18023066021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 18023066021 in words is "eighteen billion, twenty-three million, sixty-six thousand, twenty-one".