25254221 has 2 divisors, whose sum is σ = 25254222. Its totient is φ = 25254220.

The previous prime is 25254217. The next prime is 25254223. The reversal of 25254221 is 12245252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 4778596 = 4525^2 + 2186^2 .

It is a cyclic number.

It is not a de Polignac number, because 25254221 - 2² = 25254217 is a prime.

Together with 25254223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25254223) 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, 12627110 + 12627111.

It is an arithmetic number, because the mean of its divisors is an integer number (12627111).

Almost surely, 2^25254221 is an apocalyptic number.

It is an amenable number.

25254221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25254221 is an equidigital number, since it uses as much as digits as its factorization.

25254221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 23.

The square root of 25254221 is about 5025.3577982070. The cubic root of 25254221 is about 293.3895620802.

Adding to 25254221 its reverse (12245252), we get a palindrome (37499473).

The spelling of 25254221 in words is "twenty-five million, two hundred fifty-four thousand, two hundred twenty-one".