21853636800 has 168 divisors, whose sum is σ = 72115320336. Its totient is φ = 5793730560.

The previous prime is 21853636759. The next prime is 21853636813. The reversal of 21853636800 is 863635812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 817242 + ... + 843558.

Almost surely, 2^21853636800 is an apocalyptic number.

21853636800 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 21853636800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36057660168).

21853636800 is an abundant number, since it is smaller than the sum of its proper divisors (50261683536).

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

21853636800 is a wasteful number, since it uses less digits than its factorization.

21853636800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26515 (or 26500 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21853636800 in words is "twenty-one billion, eight hundred fifty-three million, six hundred thirty-six thousand, eight hundred".