33421 has 4 divisors (see below), whose sum is σ = 35200.
Its totient is φ = 31644.
The previous prime is 33413. The next prime is 33427. The reversal of 33421 is 12433.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 33421 - 23 = 33413 is a prime.
It is a super-2 number, since 2×334212 = 2233926482, which contains 22 as substring.
It is a Duffinian number.
It is a plaindrome in base 13.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (33427) 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, 861 + ... + 898.
It is an arithmetic number, because the mean of its divisors is an integer number (8800).
233421 is an apocalyptic number.
It is an amenable number.
33421 is a deficient number, since it is larger than the sum of its proper divisors (1779).
33421 is a wasteful number, since it uses less digits than its factorization.
33421 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1778.
The product of its digits is 72, while the sum is 13.
The square root of 33421 is about 182.8141132407.
The cubic root of 33421 is about 32.2111685342.
Adding to 33421 its reverse (12433), we get a palindrome (45854).
It can be divided in two parts, 33 and 421, that added together give a palindrome (454).
The spelling of 33421 in words is "thirty-three thousand, four hundred twenty-one".