21606720750 has 96 divisors (see below), whose sum is σ = 58486562784. Its totient is φ = 5755680000.

The previous prime is 21606720719. The next prime is 21606720767. The reversal of 21606720750 is 5702760612.

21606720750 is a `hidden beast` number, since 21 + 606 + 7 + 20 + 7 + 5 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2360182 + ... + 2369318.

It is an arithmetic number, because the mean of its divisors is an integer number (609235029).

Almost surely, 2^21606720750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21606720750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29243281392).

21606720750 is an abundant number, since it is smaller than the sum of its proper divisors (36879842034).

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

21606720750 is a wasteful number, since it uses less digits than its factorization.

21606720750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10211 (or 10198 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 21606720750 in words is "twenty-one billion, six hundred six million, seven hundred twenty thousand, seven hundred fifty".