25230221 has 2 divisors, whose sum is σ = 25230222. Its totient is φ = 25230220.

The previous prime is 25230217. The next prime is 25230223. The reversal of 25230221 is 12203252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23872996 + 1357225 = 4886^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 25230221 - 2² = 25230217 is a prime.

Together with 25230223, 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 25230221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25230223) 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, 12615110 + 12615111.

It is an arithmetic number, because the mean of its divisors is an integer number (12615111).

Almost surely, 2^25230221 is an apocalyptic number.

It is an amenable number.

25230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25230221 is an equidigital number, since it uses as much as digits as its factorization.

25230221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 25230221 is about 5022.9693409377. The cubic root of 25230221 is about 293.2965930511.

Adding to 25230221 its reverse (12203252), we get a palindrome (37433473).

The spelling of 25230221 in words is "twenty-five million, two hundred thirty thousand, two hundred twenty-one".