21158560912 has 20 divisors (see below), whose sum is σ = 41006264320. Its totient is φ = 10576299168.

The previous prime is 21158560879. The next prime is 21158560931. The reversal of 21158560912 is 21906585112.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 127212 + ... + 241867.

It is an arithmetic number, because the mean of its divisors is an integer number (2050313216).

Almost surely, 2^21158560912 is an apocalyptic number.

It is an amenable number.

21158560912 is a deficient number, since it is larger than the sum of its proper divisors (19847703408).

21158560912 is a wasteful number, since it uses less digits than its factorization.

21158560912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372670 (or 372664 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 21158560912 in words is "twenty-one billion, one hundred fifty-eight million, five hundred sixty thousand, nine hundred twelve".