16321218019 has 4 divisors (see below), whose sum is σ = 16323586560. Its totient is φ = 16318849480.

The previous prime is 16321218007. The next prime is 16321218047. The reversal of 16321218019 is 91081212361.

16321218019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91081212361 = 19 ⋅4793748019.

It is a cyclic number.

It is not a de Polignac number, because 16321218019 - 2¹¹ = 16321215971 is a prime.

It is a super-2 number, since 2×16321218019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16321218059) 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 3 ways as a sum of consecutive naturals, for example, 1173904 + ... + 1187725.

It is an arithmetic number, because the mean of its divisors is an integer number (4080896640).

Almost surely, 2^16321218019 is an apocalyptic number.

16321218019 is a deficient number, since it is larger than the sum of its proper divisors (2368541).

16321218019 is an equidigital number, since it uses as much as digits as its factorization.

16321218019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368540.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 16321218019 in words is "sixteen billion, three hundred twenty-one million, two hundred eighteen thousand, nineteen".