203011321013 has 4 divisors (see below), whose sum is σ = 203522684940. Its totient is φ = 202499957088.

The previous prime is 203011320989. The next prime is 203011321033. The reversal of 203011321013 is 310123110302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149299550449 + 53711770564 = 386393^2 + 231758^2 .

It is a cyclic number.

It is not a de Polignac number, because 203011321013 - 2⁶ = 203011320949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203011320982 and 203011321000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203011321033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255681368 + ... + 255682161.

It is an arithmetic number, because the mean of its divisors is an integer number (50880671235).

Almost surely, 2^203011321013 is an apocalyptic number.

It is an amenable number.

203011321013 is a deficient number, since it is larger than the sum of its proper divisors (511363927).

203011321013 is an equidigital number, since it uses as much as digits as its factorization.

203011321013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511363926.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 203011321013 its reverse (310123110302), we get a palindrome (513134431315).

The spelling of 203011321013 in words is "two hundred three billion, eleven million, three hundred twenty-one thousand, thirteen".