26421 has 4 divisors (see below), whose sum is σ = 35232.
Its totient is φ = 17612.
The previous prime is 26417. The next prime is 26423. The reversal of 26421 is 12462.
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 26421 - 22 = 26417 is a prime.
It is a D-number.
It is a plaindrome in base 12.
It is a self number, because there is not a number n which added to its sum of digits gives 26421.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (26423) 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, 4401 + ... + 4406.
It is an arithmetic number, because the mean of its divisors is an integer number (8808).
226421 is an apocalyptic number.
It is an amenable number.
26421 is a deficient number, since it is larger than the sum of its proper divisors (8811).
26421 is an equidigital number, since it uses as much as digits as its factorization.
26421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 8810.
The product of its digits is 96, while the sum is 15.
The square root of 26421 is about 162.5453782794.
The cubic root of 26421 is about 29.7840041475.
Adding to 26421 its reverse (12462), we get a palindrome (38883).
The spelling of 26421 in words is "twenty-six thousand, four hundred twenty-one".