26538221 has 4 divisors (see below), whose sum is σ = 27102912. Its totient is φ = 25973532.

The previous prime is 26538199. The next prime is 26538223. The reversal of 26538221 is 12283562.

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 26538221 - 2¹⁸ = 26276077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26538223) 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, 282275 + ... + 282368.

It is an arithmetic number, because the mean of its divisors is an integer number (6775728).

Almost surely, 2^26538221 is an apocalyptic number.

It is an amenable number.

26538221 is a deficient number, since it is larger than the sum of its proper divisors (564691).

26538221 is an equidigital number, since it uses as much as digits as its factorization.

26538221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564690.

The product of its digits is 5760, while the sum is 29.

The square root of 26538221 is about 5151.5260845695. The cubic root of 26538221 is about 298.2798633578.

The spelling of 26538221 in words is "twenty-six million, five hundred thirty-eight thousand, two hundred twenty-one".