21659130 has 64 divisors (see below), whose sum is σ = 58423680. Its totient is φ = 5709312.

The previous prime is 21659117. The next prime is 21659137. The reversal of 21659130 is 3195612.

21659130 is a `hidden beast` number, since 2 + 1 + 659 + 1 + 3 + 0 = 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 = 21659094 and 21659103.

It is not an unprimeable number, because it can be changed into a prime (21659137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25777 + ... + 26603.

It is an arithmetic number, because the mean of its divisors is an integer number (912870).

Almost surely, 2^21659130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21659130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29211840).

21659130 is an abundant number, since it is smaller than the sum of its proper divisors (36764550).

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

21659130 is a wasteful number, since it uses less digits than its factorization.

21659130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 21659130 is about 4653.9370429777. The cubic root of 21659130 is about 278.7492254666.

The spelling of 21659130 in words is "twenty-one million, six hundred fifty-nine thousand, one hundred thirty".