21938834 has 8 divisors (see below), whose sum is σ = 33016368. Its totient is φ = 10933380.

The previous prime is 21938831. The next prime is 21938843. The reversal of 21938834 is 43883912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21938831) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17252 + ... + 18479.

It is an arithmetic number, because the mean of its divisors is an integer number (4127046).

Almost surely, 2^21938834 is an apocalyptic number.

21938834 is a deficient number, since it is larger than the sum of its proper divisors (11077534).

21938834 is a wasteful number, since it uses less digits than its factorization.

21938834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36040.

The product of its digits is 41472, while the sum is 38.

The square root of 21938834 is about 4683.8909039387. The cubic root of 21938834 is about 279.9440109140.

The spelling of 21938834 in words is "twenty-one million, nine hundred thirty-eight thousand, eight hundred thirty-four".