25222121 has 2 divisors, whose sum is σ = 25222122. Its totient is φ = 25222120.

The previous prime is 25222103. The next prime is 25222129. The reversal of 25222121 is 12122252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 4791721 = 4520^2 + 2189^2 .

It is a cyclic number.

It is not a de Polignac number, because 25222121 - 2¹⁴ = 25205737 is a prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 25222121.

It is not a weakly prime, because it can be changed into another prime (25222129) 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, 12611060 + 12611061.

It is an arithmetic number, because the mean of its divisors is an integer number (12611061).

Almost surely, 2^25222121 is an apocalyptic number.

It is an amenable number.

25222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25222121 is an equidigital number, since it uses as much as digits as its factorization.

25222121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160, while the sum is 17.

The square root of 25222121 is about 5022.1629802307. The cubic root of 25222121 is about 293.2652026974.

Adding to 25222121 its reverse (12122252), we get a palindrome (37344373).

The spelling of 25222121 in words is "twenty-five million, two hundred twenty-two thousand, one hundred twenty-one".