21303927768 has 16 divisors (see below), whose sum is σ = 53259819480. Its totient is φ = 7101309248.

The previous prime is 21303927751. The next prime is 21303927779. The reversal of 21303927768 is 86772930312.

It is a super-2 number, since 2×21303927768² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 443831805 + ... + 443831852.

Almost surely, 2^21303927768 is an apocalyptic number.

It is an amenable number.

21303927768 is an abundant number, since it is smaller than the sum of its proper divisors (31955891712).

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

21303927768 is a wasteful number, since it uses less digits than its factorization.

21303927768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887663666 (or 887663662 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 21303927768 in words is "twenty-one billion, three hundred three million, nine hundred twenty-seven thousand, seven hundred sixty-eight".