25145221 has 2 divisors, whose sum is σ = 25145222. Its totient is φ = 25145220.

The previous prime is 25145209. The next prime is 25145273. The reversal of 25145221 is 12254152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 4796100 = 4511^2 + 2190^2 .

It is a cyclic number.

It is not a de Polignac number, because 25145221 - 2⁹ = 25144709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25145192 and 25145201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25145201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12572610 + 12572611.

It is an arithmetic number, because the mean of its divisors is an integer number (12572611).

Almost surely, 2^25145221 is an apocalyptic number.

It is an amenable number.

25145221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25145221 is an equidigital number, since it uses as much as digits as its factorization.

25145221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 22.

The square root of 25145221 is about 5014.5010718914. The cubic root of 25145221 is about 292.9668527851.

Adding to 25145221 its reverse (12254152), we get a palindrome (37399373).

The spelling of 25145221 in words is "twenty-five million, one hundred forty-five thousand, two hundred twenty-one".