21159705292 has 12 divisors (see below), whose sum is σ = 40395801096. Its totient is φ = 9618047840.

The previous prime is 21159705263. The next prime is 21159705313. The reversal of 21159705292 is 29250795112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240451153 + ... + 240451240.

It is an arithmetic number, because the mean of its divisors is an integer number (3366316758).

Almost surely, 2^21159705292 is an apocalyptic number.

21159705292 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21159705292 is a deficient number, since it is larger than the sum of its proper divisors (19236095804).

21159705292 is a wasteful number, since it uses less digits than its factorization.

21159705292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480902408 (or 480902406 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 21159705292 in words is "twenty-one billion, one hundred fifty-nine million, seven hundred five thousand, two hundred ninety-two".