26405221 has 4 divisors (see below), whose sum is σ = 26419744. Its totient is φ = 26390700.

The previous prime is 26405213. The next prime is 26405227. The reversal of 26405221 is 12250462.

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 26405221 - 2³ = 26405213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26405192 and 26405201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26405227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4065 + ... + 8326.

It is an arithmetic number, because the mean of its divisors is an integer number (6604936).

Almost surely, 2^26405221 is an apocalyptic number.

It is an amenable number.

26405221 is a deficient number, since it is larger than the sum of its proper divisors (14523).

26405221 is a wasteful number, since it uses less digits than its factorization.

26405221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14522.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 26405221 is about 5138.6010742224. The cubic root of 26405221 is about 297.7807382207.

Adding to 26405221 its reverse (12250462), we get a palindrome (38655683).

The spelling of 26405221 in words is "twenty-six million, four hundred five thousand, two hundred twenty-one".