16121684123 has 4 divisors (see below), whose sum is σ = 16264354008. Its totient is φ = 15979014240.

The previous prime is 16121684119. The next prime is 16121684143. The reversal of 16121684123 is 32148612161.

16121684123 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.

It is a cyclic number.

It is not a de Polignac number, because 16121684123 - 2² = 16121684119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16121684143) 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, 71334773 + ... + 71334998.

It is an arithmetic number, because the mean of its divisors is an integer number (4066088502).

Almost surely, 2^16121684123 is an apocalyptic number.

16121684123 is a deficient number, since it is larger than the sum of its proper divisors (142669885).

16121684123 is a wasteful number, since it uses less digits than its factorization.

16121684123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142669884.

The product of its digits is 13824, while the sum is 35.

The spelling of 16121684123 in words is "sixteen billion, one hundred twenty-one million, six hundred eighty-four thousand, one hundred twenty-three".