26221 has 4 divisors (see below), whose sum is σ = 28252. Its totient is φ = 24192.

The previous prime is 26209. The next prime is 26227. The reversal of 26221 is 12262.

Adding to 26221 its reverse (12262), we get a palindrome (38483).

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12262 = 2 ⋅6131.

It can be written as a sum of positive squares in 2 ways, for example, as 12996 + 13225 = 114^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 26221 - 2^{5} = 26189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 2017 = 26221 / (2 + 6 + 2 + 2 + 1).

It is a Duffinian number.

26221 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26227) 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, 996 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (7063).

2^{26221} is an apocalyptic number.

26221 is the 115-th centered square number.

It is an amenable number.

26221 is a deficient number, since it is larger than the sum of its proper divisors (2031).

26221 is a wasteful number, since it uses less digits than its factorization.

26221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030.

The product of its digits is 48, while the sum is 13.

The square root of 26221 is about 161.9289967856. The cubic root of 26221 is about 29.7086613668.

The spelling of 26221 in words is "twenty-six thousand, two hundred twenty-one".

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