18585722121 has 16 divisors (see below), whose sum is σ = 25017819840. Its totient is φ = 12272207360.

The previous prime is 18585722069. The next prime is 18585722123. The reversal of 18585722121 is 12122758581.

It is a cyclic number.

It is not a de Polignac number, because 18585722121 - 2¹⁰ = 18585721097 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18585722123) 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, 483550 + ... + 520568.

It is an arithmetic number, because the mean of its divisors is an integer number (1563613740).

Almost surely, 2^18585722121 is an apocalyptic number.

It is an amenable number.

18585722121 is a deficient number, since it is larger than the sum of its proper divisors (6432097719).

18585722121 is a wasteful number, since it uses less digits than its factorization.

18585722121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38616.

The product of its digits is 89600, while the sum is 42.

The spelling of 18585722121 in words is "eighteen billion, five hundred eighty-five million, seven hundred twenty-two thousand, one hundred twenty-one".