203131321213 has 4 divisors (see below), whose sum is σ = 205702603840. Its totient is φ = 200560038588.

The previous prime is 203131321207. The next prime is 203131321231. The reversal of 203131321213 is 312123131302.

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 a cyclic number.

It is not a de Polignac number, because 203131321213 - 2²¹ = 203129224061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203131321013) 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, 1285641195 + ... + 1285641352.

It is an arithmetic number, because the mean of its divisors is an integer number (51425650960).

Almost surely, 2^203131321213 is an apocalyptic number.

It is an amenable number.

203131321213 is a deficient number, since it is larger than the sum of its proper divisors (2571282627).

203131321213 is an equidigital number, since it uses as much as digits as its factorization.

203131321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571282626.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 203131321213 its reverse (312123131302), we get a palindrome (515254452515).

The spelling of 203131321213 in words is "two hundred three billion, one hundred thirty-one million, three hundred twenty-one thousand, two hundred thirteen".