18216368219121 has 128 divisors (see below), whose sum is σ = 28971886325760. Its totient is φ = 10092609331200.

The previous prime is 18216368219117. The next prime is 18216368219123. The reversal of 18216368219121 is 12191286361281.

It is not a de Polignac number, because 18216368219121 - 2² = 18216368219117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (18216368219123) 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 127 ways as a sum of consecutive naturals, for example, 779431566 + ... + 779454936.

It is an arithmetic number, because the mean of its divisors is an integer number (226342861920).

Almost surely, 2^{18216368219121} is an apocalyptic number.

It is an amenable number.

18216368219121 is a deficient number, since it is larger than the sum of its proper divisors (10755518106639).

18216368219121 is a wasteful number, since it uses less digits than its factorization.

18216368219121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24327.

The product of its digits is 497664, while the sum is 51.

The spelling of 18216368219121 in words is "eighteen trillion, two hundred sixteen billion, three hundred sixty-eight million, two hundred nineteen thousand, one hundred twenty-one".