21055536000 has 384 divisors, whose sum is σ = 76689793440. Its totient is φ = 5535129600.

The previous prime is 21055535999. The next prime is 21055536013. The reversal of 21055536000 is 63555012.

21055536000 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 5 + 53 + 600 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10510999 + ... + 10513001.

Almost surely, 2^21055536000 is an apocalyptic number.

21055536000 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 21055536000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38344896720).

21055536000 is an abundant number, since it is smaller than the sum of its proper divisors (55634257440).

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

21055536000 is a wasteful number, since it uses less digits than its factorization.

21055536000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2086 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 21055536000 in words is "twenty-one billion, fifty-five million, five hundred thirty-six thousand".