21938134 has 8 divisors (see below), whose sum is σ = 32938488. Its totient is φ = 10958640.

The previous prime is 21938129. The next prime is 21938149. The reversal of 21938134 is 43183912.

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

It is a junction number, because it is equal to n+sod(n) for n = 21938096 and 21938105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2247 + ... + 6994.

It is an arithmetic number, because the mean of its divisors is an integer number (4117311).

Almost surely, 2^21938134 is an apocalyptic number.

21938134 is a deficient number, since it is larger than the sum of its proper divisors (11000354).

21938134 is a wasteful number, since it uses less digits than its factorization.

21938134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10430.

The product of its digits is 5184, while the sum is 31.

The square root of 21938134 is about 4683.8161791428. The cubic root of 21938134 is about 279.9410335012.

The spelling of 21938134 in words is "twenty-one million, nine hundred thirty-eight thousand, one hundred thirty-four".