21707748000 has 288 divisors, whose sum is σ = 77645760192. Its totient is φ = 5743296000.

The previous prime is 21707747993. The next prime is 21707748031. The reversal of 21707748000 is 84770712.

21707748000 is a `hidden beast` number, since 2 + 170 + 7 + 7 + 480 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

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 47 ways as a sum of consecutive naturals, for example, 4713699 + ... + 4718301.

It is an arithmetic number, because the mean of its divisors is an integer number (269603334).

Almost surely, 2^21707748000 is an apocalyptic number.

21707748000 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 21707748000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38822880096).

21707748000 is an abundant number, since it is smaller than the sum of its proper divisors (55938012192).

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

21707748000 is a wasteful number, since it uses less digits than its factorization.

21707748000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4744 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The spelling of 21707748000 in words is "twenty-one billion, seven hundred seven million, seven hundred forty-eight thousand".