26640121 has 2 divisors, whose sum is σ = 26640122. Its totient is φ = 26640120.

The previous prime is 26640101. The next prime is 26640127. The reversal of 26640121 is 12104662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 8620096 = 4245^2 + 2936^2 .

It is a cyclic number.

It is not a de Polignac number, because 26640121 - 2⁷ = 26639993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26640092 and 26640101.

It is not a weakly prime, because it can be changed into another prime (26640127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13320060 + 13320061.

It is an arithmetic number, because the mean of its divisors is an integer number (13320061).

Almost surely, 2^26640121 is an apocalyptic number.

It is an amenable number.

26640121 is a deficient number, since it is larger than the sum of its proper divisors (1).

26640121 is an equidigital number, since it uses as much as digits as its factorization.

26640121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 26640121 is about 5161.4068818492. The cubic root of 26640121 is about 298.6611486267.

Adding to 26640121 its reverse (12104662), we get a palindrome (38744783).

The spelling of 26640121 in words is "twenty-six million, six hundred forty thousand, one hundred twenty-one".