21384009360 has 120 divisors (see below), whose sum is σ = 82073883840. Its totient is φ = 4887772416.

The previous prime is 21384009359. The next prime is 21384009389. The reversal of 21384009360 is 6390048312.

21384009360 is a `hidden beast` number, since 213 + 8 + 400 + 9 + 36 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2116390 + ... + 2126469.

It is an arithmetic number, because the mean of its divisors is an integer number (683949032).

Almost surely, 2^21384009360 is an apocalyptic number.

21384009360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21384009360 is an abundant number, since it is smaller than the sum of its proper divisors (60689874480).

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

21384009360 is a wasteful number, since it uses less digits than its factorization.

21384009360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242885 (or 4242876 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 21384009360 in words is "twenty-one billion, three hundred eighty-four million, nine thousand, three hundred sixty".