25360021 has 2 divisors, whose sum is σ = 25360022. Its totient is φ = 25360020.

The previous prime is 25360019. The next prime is 25360043. The reversal of 25360021 is 12006352.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24850225 + 509796 = 4985^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 25360021 - 2¹ = 25360019 is a prime.

Together with 25360019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25360061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12680010 + 12680011.

It is an arithmetic number, because the mean of its divisors is an integer number (12680011).

Almost surely, 2^25360021 is an apocalyptic number.

It is an amenable number.

25360021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25360021 is an equidigital number, since it uses as much as digits as its factorization.

25360021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 25360021 is about 5035.8734098466. The cubic root of 25360021 is about 293.7986998781.

Adding to 25360021 its reverse (12006352), we get a palindrome (37366373).

The spelling of 25360021 in words is "twenty-five million, three hundred sixty thousand, twenty-one".