203311321311 has 32 divisors (see below), whose sum is σ = 320848806400. Its totient is φ = 114443860608.

The previous prime is 203311321277. The next prime is 203311321357. The reversal of 203311321311 is 113123113302.

It is a happy number.

It is not a de Polignac number, because 203311321311 - 2⁷ = 203311321183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203311321391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1405546 + ... + 1543431.

It is an arithmetic number, because the mean of its divisors is an integer number (10026525200).

Almost surely, 2^203311321311 is an apocalyptic number.

203311321311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

203311321311 is a deficient number, since it is larger than the sum of its proper divisors (117537485089).

203311321311 is an equidigital number, since it uses as much as digits as its factorization.

203311321311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949068 (or 2949054 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 203311321311 its reverse (113123113302), we get a palindrome (316434434613).

The spelling of 203311321311 in words is "two hundred three billion, three hundred eleven million, three hundred twenty-one thousand, three hundred eleven".