26128321 has 2 divisors, whose sum is σ = 26128322. Its totient is φ = 26128320.

The previous prime is 26128279. The next prime is 26128331. The reversal of 26128321 is 12382162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25897921 + 230400 = 5089^2 + 480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26128321 is a prime.

It is not a weakly prime, because it can be changed into another prime (26128331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13064160 + 13064161.

It is an arithmetic number, because the mean of its divisors is an integer number (13064161).

Almost surely, 2^26128321 is an apocalyptic number.

It is an amenable number.

26128321 is a deficient number, since it is larger than the sum of its proper divisors (1).

26128321 is an equidigital number, since it uses as much as digits as its factorization.

26128321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 26128321 is about 5111.5869355808. The cubic root of 26128321 is about 296.7361796177.

It can be divided in two parts, 261 and 28321, that added together give a palindrome (28582).

The spelling of 26128321 in words is "twenty-six million, one hundred twenty-eight thousand, three hundred twenty-one".