21328837768 has 32 divisors (see below), whose sum is σ = 45795576960. Its totient is φ = 9122745600.

The previous prime is 21328837763. The next prime is 21328837781. The reversal of 21328837768 is 86773882312.

It is not an unprimeable number, because it can be changed into a prime (21328837763) by changing a digit.

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, 350433 + ... + 406768.

It is an arithmetic number, because the mean of its divisors is an integer number (1431111780).

Almost surely, 2^21328837768 is an apocalyptic number.

21328837768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21328837768 is an abundant number, since it is smaller than the sum of its proper divisors (24466739192).

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

21328837768 is a wasteful number, since it uses less digits than its factorization.

21328837768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757717 (or 757713 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 55.

The spelling of 21328837768 in words is "twenty-one billion, three hundred twenty-eight million, eight hundred thirty-seven thousand, seven hundred sixty-eight".