203021320013 has 6 divisors (see below), whose sum is σ = 215666246826. Its totient is φ = 191078889152.

The previous prime is 203021320001. The next prime is 203021320037. The reversal of 203021320013 is 310023120302.

It can be written as a sum of positive squares in 3 ways, for example, as 34327937284 + 168693382729 = 185278^2 + 410723^2 .

It is not a de Polignac number, because 203021320013 - 2²⁰ = 203020271437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203021319973 and 203021320000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203021320043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 351247670 + ... + 351248247.

It is an arithmetic number, because the mean of its divisors is an integer number (35944374471).

Almost surely, 2^203021320013 is an apocalyptic number.

It is an amenable number.

203021320013 is a deficient number, since it is larger than the sum of its proper divisors (12644926813).

203021320013 is an equidigital number, since it uses as much as digits as its factorization.

203021320013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702495951 (or 702495934 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 203021320013 its reverse (310023120302), we get a palindrome (513044440315).

The spelling of 203021320013 in words is "two hundred three billion, twenty-one million, three hundred twenty thousand, thirteen".