18269000021 has 2 divisors, whose sum is σ = 18269000022. Its totient is φ = 18269000020.

The previous prime is 18269000017. The next prime is 18269000039. The reversal of 18269000021 is 12000096281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18268495921 + 504100 = 135161^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 18269000021 - 2² = 18269000017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18269009021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9134500010 + 9134500011.

It is an arithmetic number, because the mean of its divisors is an integer number (9134500011).

Almost surely, 2^18269000021 is an apocalyptic number.

It is an amenable number.

18269000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18269000021 is an equidigital number, since it uses as much as digits as its factorization.

18269000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 18269000021 in words is "eighteen billion, two hundred sixty-nine million, twenty-one", and thus it is an aban number.