21282360 has 128 divisors (see below), whose sum is σ = 72783360. Its totient is φ = 4928000.

The previous prime is 21282353. The next prime is 21282361. The reversal of 21282360 is 6328212.

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 21282360.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21282361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30010 + ... + 30710.

It is an arithmetic number, because the mean of its divisors is an integer number (568620).

Almost surely, 2^21282360 is an apocalyptic number.

21282360 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 21282360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36391680).

21282360 is an abundant number, since it is smaller than the sum of its proper divisors (51501000).

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

21282360 is a wasteful number, since it uses less digits than its factorization.

21282360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 745 counting only the distinct ones).

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

The square root of 21282360 is about 4613.2808282176. The cubic root of 21282360 is about 277.1234402280.

The spelling of 21282360 in words is "twenty-one million, two hundred eighty-two thousand, three hundred sixty".