21324360 has 64 divisors (see below), whose sum is σ = 64774080. Its totient is φ = 5615360.

The previous prime is 21324313. The next prime is 21324361. The reversal of 21324360 is 6342312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21324361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8890 + ... + 11030.

It is an arithmetic number, because the mean of its divisors is an integer number (1012095).

Almost surely, 2^21324360 is an apocalyptic number.

21324360 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 21324360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32387040).

21324360 is an abundant number, since it is smaller than the sum of its proper divisors (43449720).

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

21324360 is a wasteful number, since it uses less digits than its factorization.

21324360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238 (or 2234 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 21324360 is about 4617.8306595197. The cubic root of 21324360 is about 277.3056182754.

Adding to 21324360 its reverse (6342312), we get a palindrome (27666672).

The spelling of 21324360 in words is "twenty-one million, three hundred twenty-four thousand, three hundred sixty".