26016721 has 2 divisors, whose sum is σ = 26016722. Its totient is φ = 26016720.

The previous prime is 26016649. The next prime is 26016733. The reversal of 26016721 is 12761062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17106496 + 8910225 = 4136^2 + 2985^2 .

It is a cyclic number.

It is not a de Polignac number, because 26016721 - 2⁹ = 26016209 is a prime.

It is not a weakly prime, because it can be changed into another prime (26016751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13008360 + 13008361.

It is an arithmetic number, because the mean of its divisors is an integer number (13008361).

Almost surely, 2^26016721 is an apocalyptic number.

It is an amenable number.

26016721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26016721 is an equidigital number, since it uses as much as digits as its factorization.

26016721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 26016721 is about 5100.6588790077. The cubic root of 26016721 is about 296.3131007913.

Adding to 26016721 its reverse (12761062), we get a palindrome (38777783).

The spelling of 26016721 in words is "twenty-six million, sixteen thousand, seven hundred twenty-one".