1312231221331 has 16 divisors (see below), whose sum is σ = 1407313612800. Its totient is φ = 1219143639168.

The previous prime is 1312231221313. The next prime is 1312231221341. The reversal of 1312231221331 is 1331221322131.

It is a cyclic number.

It is not a de Polignac number, because 1312231221331 - 2⁹ = 1312231220819 is a prime.

It is a super-2 number, since 2×1312231221331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312231221296 and 1312231221305.

It is not an unprimeable number, because it can be changed into a prime (1312231221341) 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, 6239550 + ... + 6446428.

It is an arithmetic number, because the mean of its divisors is an integer number (87957100800).

Almost surely, 2^{1312231221331} is an apocalyptic number.

1312231221331 is a deficient number, since it is larger than the sum of its proper divisors (95082391469).

1312231221331 is a wasteful number, since it uses less digits than its factorization.

1312231221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211698.

The product of its digits is 1296, while the sum is 25.

Adding to 1312231221331 its reverse (1331221322131), we get a palindrome (2643452543462).

The spelling of 1312231221331 in words is "one trillion, three hundred twelve billion, two hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-one".