21384568384 has 56 divisors (see below), whose sum is σ = 43414541568. Its totient is φ = 10448148480.

The previous prime is 21384568363. The next prime is 21384568411. The reversal of 21384568384 is 48386548312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492649 + ... + 534295.

Almost surely, 2^21384568384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21384568384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21707270784).

21384568384 is an abundant number, since it is smaller than the sum of its proper divisors (22029973184).

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

21384568384 is a wasteful number, since it uses less digits than its factorization.

21384568384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41843 (or 41833 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 52.

The spelling of 21384568384 in words is "twenty-one billion, three hundred eighty-four million, five hundred sixty-eight thousand, three hundred eighty-four".