225112121 has 4 divisors (see below), whose sum is σ = 242428452. Its totient is φ = 207795792.

The previous prime is 225112087. The next prime is 225112127. The reversal of 225112121 is 121211522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77246521 + 147865600 = 8789^2 + 12160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225112121 is a prime.

It is a super-2 number, since 2×225112121² = 101350934042237282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225112121.

It is not an unprimeable number, because it can be changed into a prime (225112127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8658146 + ... + 8658171.

It is an arithmetic number, because the mean of its divisors is an integer number (60607113).

Almost surely, 2^225112121 is an apocalyptic number.

It is an amenable number.

225112121 is a deficient number, since it is larger than the sum of its proper divisors (17316331).

225112121 is a wasteful number, since it uses less digits than its factorization.

225112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17316330.

The product of its digits is 80, while the sum is 17.

The square root of 225112121 is about 15003.7369011857. The cubic root of 225112121 is about 608.3212113095.

Adding to 225112121 its reverse (121211522), we get a palindrome (346323643).

The spelling of 225112121 in words is "two hundred twenty-five million, one hundred twelve thousand, one hundred twenty-one".