21867836928 has 80 divisors (see below), whose sum is σ = 66579786240. Its totient is φ = 6247950336.

The previous prime is 21867836923. The next prime is 21867836929. The reversal of 21867836928 is 82963876812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21867836923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006168 + ... + 1027671.

It is an arithmetic number, because the mean of its divisors is an integer number (832247328).

Almost surely, 2^21867836928 is an apocalyptic number.

21867836928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21867836928 is an abundant number, since it is smaller than the sum of its proper divisors (44711949312).

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

21867836928 is an equidigital number, since it uses as much as digits as its factorization.

21867836928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033867 (or 2033851 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 60.

The spelling of 21867836928 in words is "twenty-one billion, eight hundred sixty-seven million, eight hundred thirty-six thousand, nine hundred twenty-eight".