21301 has 8 divisors (see below), whose sum is σ = 25920.
Its totient is φ = 17088.
The previous prime is 21283. The next prime is 21313. The reversal of 21301 is 10312.
21301 is nontrivially palindromic in base 16.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 21301 - 25 = 21269 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (7).
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21341) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30 + ... + 208.
It is an arithmetic number, because the mean of its divisors is an integer number (3240).
221301 is an apocalyptic number.
It is an amenable number.
21301 is a deficient number, since it is larger than the sum of its proper divisors (4619).
21301 is a wasteful number, since it uses less digits than its factorization.
21301 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 203.
The product of its (nonzero) digits is 6, while the sum is 7.
The square root of 21301 is about 145.9486210966.
The cubic root of 21301 is about 27.7204322135.
Adding to 21301 its reverse (10312), we get a palindrome (31613).
The spelling of 21301 in words is "twenty-one thousand, three hundred one", and thus it is an iban number.