21324960 has 144 divisors (see below), whose sum is σ = 74299680. Its totient is φ = 5568000.

The previous prime is 21324949. The next prime is 21324971. The reversal of 21324960 is 6942312.

It is an interprime number because it is at equal distance from previous prime (21324949) and next prime (21324971).

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84835 + ... + 85085.

It is an arithmetic number, because the mean of its divisors is an integer number (515970).

Almost surely, 2^21324960 is an apocalyptic number.

21324960 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 21324960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37149840).

21324960 is an abundant number, since it is smaller than the sum of its proper divisors (52974720).

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

21324960 is a wasteful number, since it uses less digits than its factorization.

21324960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21324960 is about 4617.8956246325. The cubic root of 21324960 is about 277.3082190851.

The spelling of 21324960 in words is "twenty-one million, three hundred twenty-four thousand, nine hundred sixty".