26115836221 has 2 divisors, whose sum is σ = 26115836222. Its totient is φ = 26115836220.

The previous prime is 26115836191. The next prime is 26115836249. The reversal of 26115836221 is 12263851162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16509680100 + 9606156121 = 128490^2 + 98011^2 .

It is a cyclic number.

It is not a de Polignac number, because 26115836221 - 2⁷ = 26115836093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26115836521) 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, 13057918110 + 13057918111.

It is an arithmetic number, because the mean of its divisors is an integer number (13057918111).

Almost surely, 2^26115836221 is an apocalyptic number.

It is an amenable number.

26115836221 is a deficient number, since it is larger than the sum of its proper divisors (1).

26115836221 is an equidigital number, since it uses as much as digits as its factorization.

26115836221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The spelling of 26115836221 in words is "twenty-six billion, one hundred fifteen million, eight hundred thirty-six thousand, two hundred twenty-one".