21768243392 has 28 divisors (see below), whose sum is σ = 49367267280. Its totient is φ = 9329246976.

The previous prime is 21768243383. The next prime is 21768243403. The reversal of 21768243392 is 29334286712.

It is a tau number, because it is divible by the number of its divisors (28).

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, 24294467 + ... + 24295362.

Almost surely, 2^21768243392 is an apocalyptic number.

It is an amenable number.

21768243392 is an abundant number, since it is smaller than the sum of its proper divisors (27599023888).

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

21768243392 is an equidigital number, since it uses as much as digits as its factorization.

21768243392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48589848 (or 48589838 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The spelling of 21768243392 in words is "twenty-one billion, seven hundred sixty-eight million, two hundred forty-three thousand, three hundred ninety-two".