26510742221 has 2 divisors, whose sum is σ = 26510742222. Its totient is φ = 26510742220.

The previous prime is 26510742169. The next prime is 26510742281. The reversal of 26510742221 is 12224701562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15404533225 + 11106208996 = 124115^2 + 105386^2 .

It is a cyclic number.

It is not a de Polignac number, because 26510742221 - 2¹⁰ = 26510741197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26510742281) 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, 13255371110 + 13255371111.

It is an arithmetic number, because the mean of its divisors is an integer number (13255371111).

Almost surely, 2^26510742221 is an apocalyptic number.

It is an amenable number.

26510742221 is a deficient number, since it is larger than the sum of its proper divisors (1).

26510742221 is an equidigital number, since it uses as much as digits as its factorization.

26510742221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 26510742221 in words is "twenty-six billion, five hundred ten million, seven hundred forty-two thousand, two hundred twenty-one".