16216628421 has 16 divisors (see below), whose sum is σ = 26011635200. Its totient is φ = 8778926448.

The previous prime is 16216628381. The next prime is 16216628429. The reversal of 16216628421 is 12482661261.

It is a happy number.

16216628421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16216628421 - 2⁷ = 16216628293 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 16216628421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16216628429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20321191 + ... + 20321988.

It is an arithmetic number, because the mean of its divisors is an integer number (1625727200).

Almost surely, 2^16216628421 is an apocalyptic number.

It is an amenable number.

16216628421 is a deficient number, since it is larger than the sum of its proper divisors (9795006779).

16216628421 is a wasteful number, since it uses less digits than its factorization.

16216628421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40643208.

The product of its digits is 55296, while the sum is 39.

The spelling of 16216628421 in words is "sixteen billion, two hundred sixteen million, six hundred twenty-eight thousand, four hundred twenty-one".