21885030 has 24 divisors (see below), whose sum is σ = 56901312. Its totient is φ = 5835984.

The previous prime is 21885023. The next prime is 21885041. The reversal of 21885030 is 3058812.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21884985 and 21885003.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 121494 + ... + 121673.

It is an arithmetic number, because the mean of its divisors is an integer number (2370888).

Almost surely, 2^21885030 is an apocalyptic number.

21885030 is an abundant number, since it is smaller than the sum of its proper divisors (35016282).

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

21885030 is a wasteful number, since it uses less digits than its factorization.

21885030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243180 (or 243177 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21885030 is about 4678.1438626874. The cubic root of 21885030 is about 279.7149735608.

The spelling of 21885030 in words is "twenty-one million, eight hundred eighty-five thousand, thirty".