16421728924881 has 16 divisors (see below), whose sum is σ = 27803985481600. Its totient is φ = 9383845099824.

The previous prime is 16421728924849. The next prime is 16421728924883. The reversal of 16421728924881 is 18842982712461.

16421728924881 is a `hidden beast` number, since 1 + 6 + 4 + 2 + 1 + 72 + 89 + 2 + 488 + 1 = 666.

It is not a de Polignac number, because 16421728924881 - 2⁵ = 16421728924849 is a prime.

It is a super-2 number, since 2×16421728924881² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16421728924883) 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, 43443727126 + ... + 43443727503.

It is an arithmetic number, because the mean of its divisors is an integer number (1737749092600).

Almost surely, 2^{16421728924881} is an apocalyptic number.

It is an amenable number.

16421728924881 is a deficient number, since it is larger than the sum of its proper divisors (11382256556719).

16421728924881 is an equidigital number, since it uses as much as digits as its factorization.

16421728924881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86887454645 (or 86887454639 counting only the distinct ones).

The product of its digits is 24772608, while the sum is 63.

The spelling of 16421728924881 in words is "sixteen trillion, four hundred twenty-one billion, seven hundred twenty-eight million, nine hundred twenty-four thousand, eight hundred eighty-one".