21600161730 has 128 divisors (see below), whose sum is σ = 66756648960. Its totient is φ = 4867611840.

The previous prime is 21600161729. The next prime is 21600161773. The reversal of 21600161730 is 3716100612.

21600161730 is a `hidden beast` number, since 2 + 1 + 600 + 16 + 17 + 30 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21600161694 and 21600161703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53707 + ... + 214673.

It is an arithmetic number, because the mean of its divisors is an integer number (521536320).

Almost surely, 2^21600161730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21600161730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33378324480).

21600161730 is an abundant number, since it is smaller than the sum of its proper divisors (45156487230).

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

21600161730 is a wasteful number, since it uses less digits than its factorization.

21600161730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161061 (or 161055 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The spelling of 21600161730 in words is "twenty-one billion, six hundred million, one hundred sixty-one thousand, seven hundred thirty".