16543336921 has 8 divisors (see below), whose sum is σ = 16586067200. Its totient is φ = 16500652560.

The previous prime is 16543336913. The next prime is 16543336933. The reversal of 16543336921 is 12963334561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16543336921 - 2³ = 16543336913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16543336721) 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 7 ways as a sum of consecutive naturals, for example, 778840 + ... + 799798.

It is an arithmetic number, because the mean of its divisors is an integer number (2073258400).

Almost surely, 2^16543336921 is an apocalyptic number.

It is an amenable number.

16543336921 is a deficient number, since it is larger than the sum of its proper divisors (42730279).

16543336921 is a wasteful number, since it uses less digits than its factorization.

16543336921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22959.

The product of its digits is 349920, while the sum is 43.

The spelling of 16543336921 in words is "sixteen billion, five hundred forty-three million, three hundred thirty-six thousand, nine hundred twenty-one".