26051821 has 2 divisors, whose sum is σ = 26051822. Its totient is φ = 26051820.

The previous prime is 26051807. The next prime is 26051849. The reversal of 26051821 is 12815062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 346921 = 5070^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 26051821 - 2⁷ = 26051693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26051881) 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 as a sum of consecutive naturals, namely, 13025910 + 13025911.

It is an arithmetic number, because the mean of its divisors is an integer number (13025911).

Almost surely, 2^26051821 is an apocalyptic number.

It is an amenable number.

26051821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26051821 is an equidigital number, since it uses as much as digits as its factorization.

26051821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 26051821 is about 5104.0984512448. The cubic root of 26051821 is about 296.4462961068.

Adding to 26051821 its reverse (12815062), we get a palindrome (38866883).

The spelling of 26051821 in words is "twenty-six million, fifty-one thousand, eight hundred twenty-one".