203113223121 has 4 divisors (see below), whose sum is σ = 270817630832. Its totient is φ = 135408815412.

The previous prime is 203113223113. The next prime is 203113223149. The reversal of 203113223121 is 121322311302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 203113223121 - 2³ = 203113223113 is a prime.

It is a super-2 number, since 2×203113223121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203113223171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33852203851 + ... + 33852203856.

It is an arithmetic number, because the mean of its divisors is an integer number (67704407708).

Almost surely, 2^203113223121 is an apocalyptic number.

It is an amenable number.

203113223121 is a deficient number, since it is larger than the sum of its proper divisors (67704407711).

203113223121 is an equidigital number, since it uses as much as digits as its factorization.

203113223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67704407710.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 203113223121 its reverse (121322311302), we get a palindrome (324435534423).

The spelling of 203113223121 in words is "two hundred three billion, one hundred thirteen million, two hundred twenty-three thousand, one hundred twenty-one".