13421 has 2 divisors, whose sum is σ = 13422.
Its totient is φ = 13420.
The previous prime is 13417. The next prime is 13441. The reversal of 13421 is 12431.
Adding to 13421 its reverse (12431), we get a palindrome (25852).
Subtracting from 13421 its reverse (12431), we obtain a triangular number (990 = T44).
It can be divided in two parts, 13 and 421, that added together give a palindrome (434).
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 13225 + 196 = 115^2 + 14^2
It is a cyclic number.
It is not a de Polignac number, because 13421 - 22 = 13417 is a prime.
It is a Chen prime.
It is a plaindrome in base 16.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (13411) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6710 + 6711.
It is an arithmetic number, because the mean of its divisors is an integer number (6711).
213421 is an apocalyptic number.
It is an amenable number.
13421 is a deficient number, since it is larger than the sum of its proper divisors (1).
13421 is an equidigital number, since it uses as much as digits as its factorization.
13421 is an evil number, because the sum of its binary digits is even.
The product of its digits is 24, while the sum is 11.
The square root of 13421 is about 115.8490397025.
The cubic root of 13421 is about 23.7644787062.
The spelling of 13421 in words is "thirteen thousand, four hundred twenty-one".