21934238 has 8 divisors (see below), whose sum is σ = 32922288. Its totient is φ = 10960144.

The previous prime is 21934223. The next prime is 21934277. The reversal of 21934238 is 83243912.

It is a happy number.

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

It is a super-2 number, since 2×21934238² = 962221593281288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (4115286).

Almost surely, 2^21934238 is an apocalyptic number.

21934238 is a deficient number, since it is larger than the sum of its proper divisors (10988050).

21934238 is a wasteful number, since it uses less digits than its factorization.

21934238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6978.

The product of its digits is 10368, while the sum is 32.

The square root of 21934238 is about 4683.4002604945. The cubic root of 21934238 is about 279.9244609152.

The spelling of 21934238 in words is "twenty-one million, nine hundred thirty-four thousand, two hundred thirty-eight".