21804159384 has 192 divisors, whose sum is σ = 71556576000. Its totient is φ = 5859060480.

The previous prime is 21804159383. The next prime is 21804159401. The reversal of 21804159384 is 48395140812.

21804159384 is a `hidden beast` number, since 2 + 18 + 0 + 41 + 593 + 8 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21804159383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1322874 + ... + 1339254.

It is an arithmetic number, because the mean of its divisors is an integer number (372690500).

Almost surely, 2^21804159384 is an apocalyptic number.

21804159384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21804159384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35778288000).

21804159384 is an abundant number, since it is smaller than the sum of its proper divisors (49752416616).

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

21804159384 is a wasteful number, since it uses less digits than its factorization.

21804159384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16558 (or 16551 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 21804159384 in words is "twenty-one billion, eight hundred four million, one hundred fifty-nine thousand, three hundred eighty-four".