21938230 has 16 divisors (see below), whose sum is σ = 39657024. Its totient is φ = 8737920.

The previous prime is 21938207. The next prime is 21938243. The reversal of 21938230 is 3283912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2142 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (2478564).

Almost surely, 2^21938230 is an apocalyptic number.

21938230 is a deficient number, since it is larger than the sum of its proper divisors (17718794).

21938230 is a wasteful number, since it uses less digits than its factorization.

21938230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9351.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21938230 is about 4683.8264271854. The cubic root of 21938230 is about 279.9414418358.

The spelling of 21938230 in words is "twenty-one million, nine hundred thirty-eight thousand, two hundred thirty".