203231223121 has 8 divisors (see below), whose sum is σ = 205524932040. Its totient is φ = 200937741312.

The previous prime is 203231223109. The next prime is 203231223131. The reversal of 203231223121 is 121322132302.

203231223121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13515225025 + 189715998096 = 116255^2 + 435564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203231223121 - 2⁵ = 203231223089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203231223092 and 203231223101.

It is not an unprimeable number, because it can be changed into a prime (203231223101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2283961 + ... + 2371273.

It is an arithmetic number, because the mean of its divisors is an integer number (25690616505).

Almost surely, 2^203231223121 is an apocalyptic number.

It is an amenable number.

203231223121 is a deficient number, since it is larger than the sum of its proper divisors (2293708919).

203231223121 is an equidigital number, since it uses as much as digits as its factorization.

203231223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113555.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 203231223121 its reverse (121322132302), we get a palindrome (324553355423).

The spelling of 203231223121 in words is "two hundred three billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty-one".