21360480 has 48 divisors (see below), whose sum is σ = 67287024. Its totient is φ = 5696000.

The previous prime is 21360439. The next prime is 21360481. The reversal of 21360480 is 8406312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

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 21360480.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21771 + ... + 22730.

It is an arithmetic number, because the mean of its divisors is an integer number (1401813).

Almost surely, 2^21360480 is an apocalyptic number.

21360480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21360480 is an abundant number, since it is smaller than the sum of its proper divisors (45926544).

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

21360480 is a wasteful number, since it uses less digits than its factorization.

21360480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44519 (or 44511 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21360480 is about 4621.7399321035. The cubic root of 21360480 is about 277.4621001726.

Adding to 21360480 its reverse (8406312), we get a palindrome (29766792).

The spelling of 21360480 in words is "twenty-one million, three hundred sixty thousand, four hundred eighty".