18682782121 has 4 divisors (see below), whose sum is σ = 19285452544. Its totient is φ = 18080111700.

The previous prime is 18682782103. The next prime is 18682782161. The reversal of 18682782121 is 12128728681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18682782121 - 2⁷ = 18682781993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18682782161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301335165 + ... + 301335226.

It is an arithmetic number, because the mean of its divisors is an integer number (4821363136).

Almost surely, 2^18682782121 is an apocalyptic number.

It is an amenable number.

18682782121 is a deficient number, since it is larger than the sum of its proper divisors (602670423).

18682782121 is an equidigital number, since it uses as much as digits as its factorization.

18682782121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602670422.

The product of its digits is 172032, while the sum is 46.

The spelling of 18682782121 in words is "eighteen billion, six hundred eighty-two million, seven hundred eighty-two thousand, one hundred twenty-one".