21889922 has 16 divisors (see below), whose sum is σ = 33475680. Its totient is φ = 10733472.

The previous prime is 21889909. The next prime is 21889927. The reversal of 21889922 is 22998812.

It is a self number, because there is not a number n which added to its sum of digits gives 21889922.

It is not an unprimeable number, because it can be changed into a prime (21889927) 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, 26654 + ... + 27462.

It is an arithmetic number, because the mean of its divisors is an integer number (2092230).

Almost surely, 2^21889922 is an apocalyptic number.

21889922 is a deficient number, since it is larger than the sum of its proper divisors (11585758).

21889922 is a wasteful number, since it uses less digits than its factorization.

21889922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057.

The product of its digits is 41472, while the sum is 41.

The square root of 21889922 is about 4678.6666904151. Note that the first 4 decimals coincide. The cubic root of 21889922 is about 279.7358137379.

The spelling of 21889922 in words is "twenty-one million, eight hundred eighty-nine thousand, nine hundred twenty-two".