26505267421 has 2 divisors, whose sum is σ = 26505267422. Its totient is φ = 26505267420.

The previous prime is 26505267401. The next prime is 26505267461. The reversal of 26505267421 is 12476250562.

It is an a-pointer prime, because the next prime (26505267461) can be obtained adding 26505267421 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18642898521 + 7862368900 = 136539^2 + 88670^2 .

It is a cyclic number.

It is not a de Polignac number, because 26505267421 - 2⁵ = 26505267389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26505267401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13252633710 + 13252633711.

It is an arithmetic number, because the mean of its divisors is an integer number (13252633711).

Almost surely, 2^26505267421 is an apocalyptic number.

It is an amenable number.

26505267421 is a deficient number, since it is larger than the sum of its proper divisors (1).

26505267421 is an equidigital number, since it uses as much as digits as its factorization.

26505267421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 26505267421 in words is "twenty-six billion, five hundred five million, two hundred sixty-seven thousand, four hundred twenty-one".