18336850120021 has 2 divisors, whose sum is σ = 18336850120022. Its totient is φ = 18336850120020.

The previous prime is 18336850120009. The next prime is 18336850120027. The reversal of 18336850120021 is 12002105863381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15837017180625 + 2499832939396 = 3979575^2 + 1581086^2 .

It is a cyclic number.

It is not a de Polignac number, because 18336850120021 - 2²¹ = 18336848022869 is a prime.

It is a super-2 number, since 2×18336850120021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18336850120027) 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, 9168425060010 + 9168425060011.

It is an arithmetic number, because the mean of its divisors is an integer number (9168425060011).

Almost surely, 2^{18336850120021} is an apocalyptic number.

It is an amenable number.

18336850120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18336850120021 is an equidigital number, since it uses as much as digits as its factorization.

18336850120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 18336850120021 in words is "eighteen trillion, three hundred thirty-six billion, eight hundred fifty million, one hundred twenty thousand, twenty-one".