18401721283 has 16 divisors (see below), whose sum is σ = 20537597952. Its totient is φ = 16347184000.

The previous prime is 18401721271. The next prime is 18401721287. The reversal of 18401721283 is 38212710481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18401721283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18401721287) 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 in 15 ways as a sum of consecutive naturals, for example, 16003 + ... + 192508.

It is an arithmetic number, because the mean of its divisors is an integer number (1283599872).

Almost surely, 2^18401721283 is an apocalyptic number.

18401721283 is a deficient number, since it is larger than the sum of its proper divisors (2135876669).

18401721283 is a wasteful number, since it uses less digits than its factorization.

18401721283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208706.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 18401721283 in words is "eighteen billion, four hundred one million, seven hundred twenty-one thousand, two hundred eighty-three".