1310312012221 has 2 divisors, whose sum is σ = 1310312012222. Its totient is φ = 1310312012220.

The previous prime is 1310312012197. The next prime is 1310312012257. The reversal of 1310312012221 is 1222102130131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013668389721 + 296643622500 = 1006811^2 + 544650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1310312012221 - 2¹⁵ = 1310311979453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1310312010221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655156006110 + 655156006111.

It is an arithmetic number, because the mean of its divisors is an integer number (655156006111).

Almost surely, 2^{1310312012221} is an apocalyptic number.

It is an amenable number.

1310312012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310312012221 is an equidigital number, since it uses as much as digits as its factorization.

1310312012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1310312012221 its reverse (1222102130131), we get a palindrome (2532414142352).

The spelling of 1310312012221 in words is "one trillion, three hundred ten billion, three hundred twelve million, twelve thousand, two hundred twenty-one".