1310312212221 has 4 divisors (see below), whose sum is σ = 1747082949632. Its totient is φ = 873541474812.

The previous prime is 1310312212171. The next prime is 1310312212361. The reversal of 1310312212221 is 1222122130131.

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 not a de Polignac number, because 1310312212221 - 2¹¹ = 1310312210173 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 (1310312214221) 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, 218385368701 + ... + 218385368706.

It is an arithmetic number, because the mean of its divisors is an integer number (436770737408).

Almost surely, 2^{1310312212221} is an apocalyptic number.

It is an amenable number.

1310312212221 is a deficient number, since it is larger than the sum of its proper divisors (436770737411).

1310312212221 is an equidigital number, since it uses as much as digits as its factorization.

1310312212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436770737410.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1310312212221 its reverse (1222122130131), we get a palindrome (2532434342352).

The spelling of 1310312212221 in words is "one trillion, three hundred ten billion, three hundred twelve million, two hundred twelve thousand, two hundred twenty-one".