26520751421 has 2 divisors, whose sum is σ = 26520751422. Its totient is φ = 26520751420.

The previous prime is 26520751403. The next prime is 26520751457. The reversal of 26520751421 is 12415702562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14982984025 + 11537767396 = 122405^2 + 107414^2 .

It is a cyclic number.

It is not a de Polignac number, because 26520751421 - 2⁶ = 26520751357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26520751121) 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, 13260375710 + 13260375711.

It is an arithmetic number, because the mean of its divisors is an integer number (13260375711).

Almost surely, 2^26520751421 is an apocalyptic number.

It is an amenable number.

26520751421 is a deficient number, since it is larger than the sum of its proper divisors (1).

26520751421 is an equidigital number, since it uses as much as digits as its factorization.

26520751421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 26520751421 in words is "twenty-six billion, five hundred twenty million, seven hundred fifty-one thousand, four hundred twenty-one".