21828360 has 32 divisors (see below), whose sum is σ = 65485440. Its totient is φ = 5820864.

The previous prime is 21828353. The next prime is 21828383. The reversal of 21828360 is 6382812.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90832 + ... + 91071.

It is an arithmetic number, because the mean of its divisors is an integer number (2046420).

Almost surely, 2^21828360 is an apocalyptic number.

21828360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21828360 is an abundant number, since it is smaller than the sum of its proper divisors (43657080).

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

21828360 is a wasteful number, since it uses less digits than its factorization.

21828360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181917 (or 181913 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21828360 is about 4672.0830472071. The cubic root of 21828360 is about 279.4733297004.

The spelling of 21828360 in words is "twenty-one million, eight hundred twenty-eight thousand, three hundred sixty".