26226721 has 2 divisors, whose sum is σ = 26226722. Its totient is φ = 26226720.

The previous prime is 26226709. The next prime is 26226727. The reversal of 26226721 is 12762262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 12321 = 5120^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 26226721 - 2⁹ = 26226209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26226721.

It is not a weakly prime, because it can be changed into another prime (26226727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13113360 + 13113361.

It is an arithmetic number, because the mean of its divisors is an integer number (13113361).

Almost surely, 2^26226721 is an apocalyptic number.

It is an amenable number.

26226721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26226721 is an equidigital number, since it uses as much as digits as its factorization.

26226721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 26226721 is about 5121.2030813081. The cubic root of 26226721 is about 297.1082186020.

Adding to 26226721 its reverse (12762262), we get a palindrome (38988983).

The spelling of 26226721 in words is "twenty-six million, two hundred twenty-six thousand, seven hundred twenty-one".