203031220113 has 10 divisors (see below), whose sum is σ = 303293551154. Its totient is φ = 135354146688.

The previous prime is 203031220111. The next prime is 203031220177. The reversal of 203031220113 is 311022130302.

It can be written as a sum of positive squares in only one way, i.e., 174863639889 + 28167580224 = 418167^2 + 167832^2 .

It is not a de Polignac number, because 203031220113 - 2¹ = 203031220111 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203031220111) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1253279056 + ... + 1253279217.

Almost surely, 2^203031220113 is an apocalyptic number.

It is an amenable number.

203031220113 is a deficient number, since it is larger than the sum of its proper divisors (100262331041).

203031220113 is an equidigital number, since it uses as much as digits as its factorization.

203031220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506558285 (or 2506558276 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 203031220113 its reverse (311022130302), we get a palindrome (514053350415).

The spelling of 203031220113 in words is "two hundred three billion, thirty-one million, two hundred twenty thousand, one hundred thirteen".