203121121 has 24 divisors (see below), whose sum is σ = 243777600. Its totient is φ = 168652512.

The previous prime is 203121109. The next prime is 203121181. The reversal of 203121121 is 121121302.

It is not a de Polignac number, because 203121121 - 2⁵ = 203121089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203121101) 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 in 23 ways as a sum of consecutive naturals, for example, 313620 + ... + 314266.

It is an arithmetic number, because the mean of its divisors is an integer number (10157400).

Almost surely, 2^203121121 is an apocalyptic number.

It is an amenable number.

203121121 is a deficient number, since it is larger than the sum of its proper divisors (40656479).

203121121 is a wasteful number, since it uses less digits than its factorization.

203121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 203121121 is about 14252.0567287673. The cubic root of 203121121 is about 587.8299300285.

Adding to 203121121 its reverse (121121302), we get a palindrome (324242423).

The spelling of 203121121 in words is "two hundred three million, one hundred twenty-one thousand, one hundred twenty-one".