225012121 has 2 divisors, whose sum is σ = 225012122. Its totient is φ = 225012120.

The previous prime is 225012107. The next prime is 225012127. The reversal of 225012121 is 121210522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157854096 + 67158025 = 12564^2 + 8195^2 .

It is a cyclic number.

It is not a de Polignac number, because 225012121 - 2⁵ = 225012089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 225012095 and 225012104.

It is not a weakly prime, because it can be changed into another prime (225012127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112506060 + 112506061.

It is an arithmetic number, because the mean of its divisors is an integer number (112506061).

Almost surely, 2^225012121 is an apocalyptic number.

It is an amenable number.

225012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

225012121 is an equidigital number, since it uses as much as digits as its factorization.

225012121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 225012121 is about 15000.4040278920. The cubic root of 225012121 is about 608.2311211939.

Adding to 225012121 its reverse (121210522), we get a palindrome (346222643).

The spelling of 225012121 in words is "two hundred twenty-five million, twelve thousand, one hundred twenty-one".