2131203311321 has 6 divisors (see below), whose sum is σ = 2479154872410. Its totient is φ = 1826745695376.

The previous prime is 2131203311311. The next prime is 2131203311323. The reversal of 2131203311321 is 1231133021312.

It can be written as a sum of positive squares in only one way, i.e., 1743815327296 + 387387984025 = 1320536^2 + 622405^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2131203311321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131203311323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21746972516 + ... + 21746972613.

It is an arithmetic number, because the mean of its divisors is an integer number (413192478735).

Almost surely, 2^{2131203311321} is an apocalyptic number.

It is an amenable number.

2131203311321 is a deficient number, since it is larger than the sum of its proper divisors (347951561089).

2131203311321 is an equidigital number, since it uses as much as digits as its factorization.

2131203311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43493945143 (or 43493945136 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 2131203311321 its reverse (1231133021312), we get a palindrome (3362336332633).

The spelling of 2131203311321 in words is "two trillion, one hundred thirty-one billion, two hundred three million, three hundred eleven thousand, three hundred twenty-one".