21726160 has 40 divisors (see below), whose sum is σ = 51380640. Its totient is φ = 8541312.

The previous prime is 21726151. The next prime is 21726161. The reversal of 21726160 is 6162712.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726161) by changing a digit.

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, 2419 + ... + 7021.

It is an arithmetic number, because the mean of its divisors is an integer number (1284516).

Almost surely, 2^21726160 is an apocalyptic number.

21726160 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 21726160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25690320).

21726160 is an abundant number, since it is smaller than the sum of its proper divisors (29654480).

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

21726160 is a wasteful number, since it uses less digits than its factorization.

21726160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675 (or 4669 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21726160 is about 4661.1329094974. The cubic root of 21726160 is about 279.0364841400.

Adding to 21726160 its reverse (6162712), we get a palindrome (27888872).

The spelling of 21726160 in words is "twenty-one million, seven hundred twenty-six thousand, one hundred sixty".