16868690305921 has 4 divisors (see below), whose sum is σ = 17412841606144. Its totient is φ = 16324539005700.

The previous prime is 16868690305871. The next prime is 16868690305937. The reversal of 16868690305921 is 12950309686861.

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 16868690305921 - 2⁹ = 16868690305409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16868694305921) 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, 272075650065 + ... + 272075650126.

It is an arithmetic number, because the mean of its divisors is an integer number (4353210401536).

Almost surely, 2^{16868690305921} is an apocalyptic number.

It is an amenable number.

16868690305921 is a deficient number, since it is larger than the sum of its proper divisors (544151300223).

16868690305921 is an equidigital number, since it uses as much as digits as its factorization.

16868690305921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544151300222.

The product of its (nonzero) digits is 33592320, while the sum is 64.

The spelling of 16868690305921 in words is "sixteen trillion, eight hundred sixty-eight billion, six hundred ninety million, three hundred five thousand, nine hundred twenty-one".