21864110784 has 56 divisors (see below), whose sum is σ = 58581096960. Its totient is φ = 7195778304.

The previous prime is 21864110747. The next prime is 21864110813. The reversal of 21864110784 is 48701146812.

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, 705564 + ... + 735899.

Almost surely, 2^21864110784 is an apocalyptic number.

21864110784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21864110784 is an abundant number, since it is smaller than the sum of its proper divisors (36716986176).

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

21864110784 is a wasteful number, since it uses less digits than its factorization.

21864110784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441557 (or 1441547 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 21864110784 in words is "twenty-one billion, eight hundred sixty-four million, one hundred ten thousand, seven hundred eighty-four".