21134 has 4 divisors (see below), whose sum is σ = 31704.
Its totient is φ = 10566.
The previous prime is 21121. The next prime is 21139. The reversal of 21134 is 43112.
Adding to 21134 its reverse (43112), we get a palindrome (64246).
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21139) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282 + ... + 5285.
It is an arithmetic number, because the mean of its divisors is an integer number (7926).
221134 is an apocalyptic number.
21134 is a deficient number, since it is larger than the sum of its proper divisors (10570).
21134 is a wasteful number, since it uses less digits than its factorization.
21134 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10569.
The product of its digits is 24, while the sum is 11.
The square root of 21134 is about 145.3753761818.
The cubic root of 21134 is about 27.6477992683.
The spelling of 21134 in words is "twenty-one thousand, one hundred thirty-four".