1312331012221 has 16 divisors (see below), whose sum is σ = 1330983638208. Its totient is φ = 1293792192000.

The previous prime is 1312331012137. The next prime is 1312331012233. The reversal of 1312331012221 is 1222101332131.

It is a cyclic number.

It is not a de Polignac number, because 1312331012221 - 2⁹ = 1312331011709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312331012192 and 1312331012201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312331012261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27868146 + ... + 27915196.

It is an arithmetic number, because the mean of its divisors is an integer number (83186477388).

Almost surely, 2^{1312331012221} is an apocalyptic number.

It is an amenable number.

1312331012221 is a deficient number, since it is larger than the sum of its proper divisors (18652625987).

1312331012221 is an equidigital number, since it uses as much as digits as its factorization.

1312331012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48252.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1312331012221 its reverse (1222101332131), we get a palindrome (2534432344352).

The spelling of 1312331012221 in words is "one trillion, three hundred twelve billion, three hundred thirty-one million, twelve thousand, two hundred twenty-one".