16809674152921 has 16 divisors (see below), whose sum is σ = 19056064587840. Its totient is φ = 14699523245760.

The previous prime is 16809674152877. The next prime is 16809674152927. The reversal of 16809674152921 is 12925147690861.

It is a cyclic number.

It is not a de Polignac number, because 16809674152921 - 2⁴³ = 8013581130713 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 16809674152921.

It is not an unprimeable number, because it can be changed into a prime (16809674152927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7508451 + ... + 9486631.

It is an arithmetic number, because the mean of its divisors is an integer number (1191004036740).

Almost surely, 2^{16809674152921} is an apocalyptic number.

It is an amenable number.

16809674152921 is a deficient number, since it is larger than the sum of its proper divisors (2246390434919).

16809674152921 is a wasteful number, since it uses less digits than its factorization.

16809674152921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012616.

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 16809674152921 in words is "sixteen trillion, eight hundred nine billion, six hundred seventy-four million, one hundred fifty-two thousand, nine hundred twenty-one".