21895930 has 16 divisors (see below), whose sum is σ = 45043200. Its totient is φ = 7507152.

The previous prime is 21895921. The next prime is 21895933. The reversal of 21895930 is 3959812.

It is a self number, because there is not a number n which added to its sum of digits gives 21895930.

It is not an unprimeable number, because it can be changed into a prime (21895933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156330 + ... + 156469.

It is an arithmetic number, because the mean of its divisors is an integer number (2815200).

Almost surely, 2^21895930 is an apocalyptic number.

21895930 is an abundant number, since it is smaller than the sum of its proper divisors (23147270).

21895930 is a wasteful number, since it uses less digits than its factorization.

21895930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312813.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 21895930 is about 4679.3087096280. The cubic root of 21895930 is about 279.7614038859.

The spelling of 21895930 in words is "twenty-one million, eight hundred ninety-five thousand, nine hundred thirty".