21934 has 8 divisors (see below), whose sum is σ = 35928. Its totient is φ = 9960.

The previous prime is 21929. The next prime is 21937. The reversal of 21934 is 43912.

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

It is a super-2 number, since 2×21934² = 962200712, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477 + ... + 520.

It is an arithmetic number, because the mean of its divisors is an integer number (4491).

2²¹⁹³⁴ is an apocalyptic number.

21934 is a deficient number, since it is larger than the sum of its proper divisors (13994).

21934 is a wasteful number, since it uses less digits than its factorization.

21934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010.

The product of its digits is 216, while the sum is 19.

The square root of 21934 is about 148.1013166721. The cubic root of 21934 is about 27.9923448461.

It can be divided in two parts, 2193 and 4, that added together give a cube (2197 = 13³).

The spelling of 21934 in words is "twenty-one thousand, nine hundred thirty-four".