16994810921 has 8 divisors (see below), whose sum is σ = 18540890688. Its totient is φ = 15448914000.

The previous prime is 16994810867. The next prime is 16994811007. The reversal of 16994810921 is 12901849961.

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 16994810921 - 2¹⁸ = 16994548777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16994810921.

It is not an unprimeable number, because it can be changed into a prime (16994810621) 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, 211676 + ... + 280706.

It is an arithmetic number, because the mean of its divisors is an integer number (2317611336).

Almost surely, 2^16994810921 is an apocalyptic number.

16994810921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16994810921 is a deficient number, since it is larger than the sum of its proper divisors (1546079767).

16994810921 is a wasteful number, since it uses less digits than its factorization.

16994810921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91423.

The product of its (nonzero) digits is 279936, while the sum is 50.

The spelling of 16994810921 in words is "sixteen billion, nine hundred ninety-four million, eight hundred ten thousand, nine hundred twenty-one".