26530221 has 16 divisors (see below), whose sum is σ = 36478784. Its totient is φ = 17138304.

The previous prime is 26530219. The next prime is 26530223. The reversal of 26530221 is 12203562.

It is an interprime number because it is at equal distance from previous prime (26530219) and next prime (26530223).

It is not a de Polignac number, because 26530221 - 2¹ = 26530219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26530223) 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 15 ways as a sum of consecutive naturals, for example, 50466 + ... + 50988.

It is an arithmetic number, because the mean of its divisors is an integer number (2279924).

Almost surely, 2^26530221 is an apocalyptic number.

It is an amenable number.

26530221 is a deficient number, since it is larger than the sum of its proper divisors (9948563).

26530221 is a wasteful number, since it uses less digits than its factorization.

26530221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 26530221 is about 5150.7495571033. The cubic root of 26530221 is about 298.2498879910.

Adding to 26530221 its reverse (12203562), we get a palindrome (38733783).

The spelling of 26530221 in words is "twenty-six million, five hundred thirty thousand, two hundred twenty-one".