203000121 has 16 divisors (see below), whose sum is σ = 310443520. Its totient is φ = 130967280.

The previous prime is 203000117. The next prime is 203000129. The reversal of 203000121 is 121000302.

It is a happy number.

It is not a de Polignac number, because 203000121 - 2² = 203000117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203000129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120430 + ... + 122103.

It is an arithmetic number, because the mean of its divisors is an integer number (19402720).

Almost surely, 2^203000121 is an apocalyptic number.

It is an amenable number.

203000121 is a deficient number, since it is larger than the sum of its proper divisors (107443399).

203000121 is a wasteful number, since it uses less digits than its factorization.

203000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242573 (or 242567 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 203000121 is about 14247.8110950419. The cubic root of 203000121 is about 587.7131826916.

Adding to 203000121 its reverse (121000302), we get a palindrome (324000423).

The spelling of 203000121 in words is "two hundred three million, one hundred twenty-one", and thus it is an aban number.