25835021 has 2 divisors, whose sum is σ = 25835022. Its totient is φ = 25835020.

The previous prime is 25834993. The next prime is 25835023. The reversal of 25835021 is 12053852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25050025 + 784996 = 5005^2 + 886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25835021 is a prime.

It is a Sophie Germain prime.

Together with 25835023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25835023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12917510 + 12917511.

It is an arithmetic number, because the mean of its divisors is an integer number (12917511).

Almost surely, 2^25835021 is an apocalyptic number.

It is an amenable number.

25835021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25835021 is an equidigital number, since it uses as much as digits as its factorization.

25835021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 25835021 is about 5082.8162469245. The cubic root of 25835021 is about 295.6216747120.

Adding to 25835021 its reverse (12053852), we get a palindrome (37888873).

The spelling of 25835021 in words is "twenty-five million, eight hundred thirty-five thousand, twenty-one".