21607861912 has 32 divisors (see below), whose sum is σ = 49864298400. Its totient is φ = 8548164864.

The previous prime is 21607861909. The next prime is 21607861937. The reversal of 21607861912 is 21916870612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14839837 + ... + 14841292.

It is an arithmetic number, because the mean of its divisors is an integer number (1558259325).

Almost surely, 2^21607861912 is an apocalyptic number.

It is an amenable number.

21607861912 is an abundant number, since it is smaller than the sum of its proper divisors (28256436488).

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

21607861912 is a wasteful number, since it uses less digits than its factorization.

21607861912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29681155 (or 29681151 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 21607861912 in words is "twenty-one billion, six hundred seven million, eight hundred sixty-one thousand, nine hundred twelve".