25225021 has 2 divisors, whose sum is σ = 25225022. Its totient is φ = 25225020.

The previous prime is 25225019. The next prime is 25225049. The reversal of 25225021 is 12052252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 4622500 = 4539^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 25225021 - 2¹ = 25225019 is a prime.

Together with 25225019, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25225021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25225001) 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, 12612510 + 12612511.

It is an arithmetic number, because the mean of its divisors is an integer number (12612511).

Almost surely, 2^25225021 is an apocalyptic number.

It is an amenable number.

25225021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25225021 is an equidigital number, since it uses as much as digits as its factorization.

25225021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 25225021 is about 5022.4516921520. The cubic root of 25225021 is about 293.2764419913.

Adding to 25225021 its reverse (12052252), we get a palindrome (37277273).

The spelling of 25225021 in words is "twenty-five million, two hundred twenty-five thousand, twenty-one".