25304221 has 2 divisors, whose sum is σ = 25304222. Its totient is φ = 25304220.

The previous prime is 25304197. The next prime is 25304233. The reversal of 25304221 is 12240352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25140196 + 164025 = 5014^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 25304221 - 2¹⁵ = 25271453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25304261) 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, 12652110 + 12652111.

It is an arithmetic number, because the mean of its divisors is an integer number (12652111).

Almost surely, 2^25304221 is an apocalyptic number.

It is an amenable number.

25304221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25304221 is an equidigital number, since it uses as much as digits as its factorization.

25304221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25304221 is about 5030.3301084521. The cubic root of 25304221 is about 293.5830585460.

Adding to 25304221 its reverse (12240352), we get a palindrome (37544573).

The spelling of 25304221 in words is "twenty-five million, three hundred four thousand, two hundred twenty-one".