21804336000 has 512 divisors, whose sum is σ = 85065552000. Its totient is φ = 5470617600.

The previous prime is 21804335999. The next prime is 21804336031. The reversal of 21804336000 is 63340812.

It is a happy number.

21804336000 is a `hidden beast` number, since 2 + 18 + 0 + 43 + 3 + 600 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7342516 + ... + 7345484.

Almost surely, 2^21804336000 is an apocalyptic number.

21804336000 is a gapful number since it is divisible by the number (20) 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 21804336000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42532776000).

21804336000 is an abundant number, since it is smaller than the sum of its proper divisors (63261216000).

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

21804336000 is a wasteful number, since it uses less digits than its factorization.

21804336000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024 (or 2996 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21804336000 its reverse (63340812), we get a palindrome (21867676812).

The spelling of 21804336000 in words is "twenty-one billion, eight hundred four million, three hundred thirty-six thousand".