26057384921 has 2 divisors, whose sum is σ = 26057384922. Its totient is φ = 26057384920.

The previous prime is 26057384911. The next prime is 26057384923. The reversal of 26057384921 is 12948375062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25773091600 + 284293321 = 160540^2 + 16861^2 .

It is a cyclic number.

It is not a de Polignac number, because 26057384921 - 2³⁴ = 8877515737 is a prime.

It is a Sophie Germain prime.

Together with 26057384923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26057384923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13028692460 + 13028692461.

It is an arithmetic number, because the mean of its divisors is an integer number (13028692461).

It is a 1-persistent number, because it is pandigital, but 2⋅26057384921 = 52114769842 is not.

Almost surely, 2^26057384921 is an apocalyptic number.

It is an amenable number.

26057384921 is a deficient number, since it is larger than the sum of its proper divisors (1).

26057384921 is an equidigital number, since it uses as much as digits as its factorization.

26057384921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 26057384921 in words is "twenty-six billion, fifty-seven million, three hundred eighty-four thousand, nine hundred twenty-one".