25703221 has 2 divisors, whose sum is σ = 25703222. Its totient is φ = 25703220.

The previous prime is 25703177. The next prime is 25703231. The reversal of 25703221 is 12230752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13242321 + 12460900 = 3639^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 25703221 - 2⁹ = 25702709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25703192 and 25703201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25703231) 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, 12851610 + 12851611.

It is an arithmetic number, because the mean of its divisors is an integer number (12851611).

Almost surely, 2^25703221 is an apocalyptic number.

It is an amenable number.

25703221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25703221 is an equidigital number, since it uses as much as digits as its factorization.

25703221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 25703221 is about 5069.8344154420. The cubic root of 25703221 is about 295.1181026684.

Adding to 25703221 its reverse (12230752), we get a palindrome (37933973).

The spelling of 25703221 in words is "twenty-five million, seven hundred three thousand, two hundred twenty-one".