21434 has 8 divisors (see below), whose sum is σ = 36768.
Its totient is φ = 9180.
The previous prime is 21433. The next prime is 21467. The reversal of 21434 is 43412.
Adding to 21434 its reverse (43412), we get a palindrome (64846).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a Harshad number since it is a multiple of its sum of digits (14), and also a Moran number because the ratio is a prime number: 1531 = 21434 / (2 + 1 + 4 + 3 + 4).
It is an alternating number because its digits alternate between even and odd.
It is a plaindrome in base 13.
It is a zygodrome in base 13.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21434.
It is not an unprimeable number, because it can be changed into a prime (21433) 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, 752 + ... + 779.
It is an arithmetic number, because the mean of its divisors is an integer number (4596).
221434 is an apocalyptic number.
21434 is a deficient number, since it is larger than the sum of its proper divisors (15334).
21434 is a wasteful number, since it uses less digits than its factorization.
21434 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1540.
The product of its digits is 96, while the sum is 14.
The square root of 21434 is about 146.4035518695.
The cubic root of 21434 is about 27.7780065166.
The spelling of 21434 in words is "twenty-one thousand, four hundred thirty-four".