21216959016 has 32 divisors (see below), whose sum is σ = 57864434400. Its totient is φ = 6429381440.

The previous prime is 21216959011. The next prime is 21216959047. The reversal of 21216959016 is 61095961212.

It is not an unprimeable number, because it can be changed into a prime (21216959011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40183371 + ... + 40183898.

It is an arithmetic number, because the mean of its divisors is an integer number (1808263575).

Almost surely, 2^21216959016 is an apocalyptic number.

It is an amenable number.

21216959016 is an abundant number, since it is smaller than the sum of its proper divisors (36647475384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21216959016 is a wasteful number, since it uses less digits than its factorization.

21216959016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80367289 (or 80367285 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 21216959016 in words is "twenty-one billion, two hundred sixteen million, nine hundred fifty-nine thousand, sixteen".