18021020122121 has 16 divisors (see below), whose sum is σ = 18389199052800. Its totient is φ = 17654999754768.

The previous prime is 18021020122117. The next prime is 18021020122123. The reversal of 18021020122121 is 12122102012081.

It is a cyclic number.

It is not a de Polignac number, because 18021020122121 - 2² = 18021020122117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18021020122123) 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 15 ways as a sum of consecutive naturals, for example, 30869486 + ... + 31447848.

It is an arithmetic number, because the mean of its divisors is an integer number (1149324940800).

Almost surely, 2^{18021020122121} is an apocalyptic number.

It is an amenable number.

18021020122121 is a deficient number, since it is larger than the sum of its proper divisors (368178930679).

18021020122121 is a wasteful number, since it uses less digits than its factorization.

18021020122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580228.

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 18021020122121 in words is "eighteen trillion, twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty-one".