21297569992 has 32 divisors (see below), whose sum is σ = 41968987200. Its totient is φ = 10112503104.

The previous prime is 21297569977. The next prime is 21297570013. The reversal of 21297569992 is 29996579212.

It is a self number, because there is not a number n which added to its sum of digits gives 21297569992.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 390783 + ... + 441934.

It is an arithmetic number, because the mean of its divisors is an integer number (1311530850).

Almost surely, 2^21297569992 is an apocalyptic number.

It is an amenable number.

21297569992 is a deficient number, since it is larger than the sum of its proper divisors (20671417208).

21297569992 is a wasteful number, since it uses less digits than its factorization.

21297569992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832885 (or 832881 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 61.

The spelling of 21297569992 in words is "twenty-one billion, two hundred ninety-seven million, five hundred sixty-nine thousand, nine hundred ninety-two".