21716160 has 56 divisors (see below), whose sum is σ = 68951856. Its totient is φ = 5790720.

The previous prime is 21716159. The next prime is 21716237. The reversal of 21716160 is 6161712.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21716160.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10351 + ... + 12270.

Almost surely, 2^21716160 is an apocalyptic number.

21716160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21716160 is an abundant number, since it is smaller than the sum of its proper divisors (47235696).

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

21716160 is a wasteful number, since it uses less digits than its factorization.

21716160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22641 (or 22631 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21716160 is about 4660.0600854495. The cubic root of 21716160 is about 278.9936664330.

Adding to 21716160 its reverse (6161712), we get a palindrome (27877872).

The spelling of 21716160 in words is "twenty-one million, seven hundred sixteen thousand, one hundred sixty".