26221513 has 2 divisors, whose sum is σ = 26221514. Its totient is φ = 26221512.

The previous prime is 26221511. The next prime is 26221543. The reversal of 26221513 is 31512262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17909824 + 8311689 = 4232^2 + 2883^2 .

It is a cyclic number.

It is not a de Polignac number, because 26221513 - 2¹ = 26221511 is a prime.

Together with 26221511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26221511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110756 + 13110757.

It is an arithmetic number, because the mean of its divisors is an integer number (13110757).

Almost surely, 2^26221513 is an apocalyptic number.

It is an amenable number.

26221513 is a deficient number, since it is larger than the sum of its proper divisors (1).

26221513 is an equidigital number, since it uses as much as digits as its factorization.

26221513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 26221513 is about 5120.6945817926. The cubic root of 26221513 is about 297.0885511029.

Adding to 26221513 its reverse (31512262), we get a palindrome (57733775).

The spelling of 26221513 in words is "twenty-six million, two hundred twenty-one thousand, five hundred thirteen".