21850230 has 32 divisors (see below), whose sum is σ = 54722304. Its totient is φ = 5573216.

The previous prime is 21850193. The next prime is 21850259. The reversal of 21850230 is 3205812.

It is a junction number, because it is equal to n+sod(n) for n = 21850197 and 21850206.

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 15 ways as a sum of consecutive naturals, for example, 15144 + ... + 16523.

It is an arithmetic number, because the mean of its divisors is an integer number (1710072).

Almost surely, 2^21850230 is an apocalyptic number.

21850230 is an abundant number, since it is smaller than the sum of its proper divisors (32872074).

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

21850230 is a wasteful number, since it uses less digits than its factorization.

21850230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31700.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21850230 is about 4674.4229590400. The cubic root of 21850230 is about 279.5666340319.

The spelling of 21850230 in words is "twenty-one million, eight hundred fifty thousand, two hundred thirty".