1312120220331 has 16 divisors (see below), whose sum is σ = 1813035663360. Its totient is φ = 843082951200.

The previous prime is 1312120220321. The next prime is 1312120220339. The reversal of 1312120220331 is 1330220212131.

It is not a de Polignac number, because 1312120220331 - 2¹⁸ = 1312119958187 is a prime.

It is a super-2 number, since 2×1312120220331² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1312120220298 and 1312120220307.

It is not an unprimeable number, because it can be changed into a prime (1312120220339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13345195 + ... + 13443156.

It is an arithmetic number, because the mean of its divisors is an integer number (113314728960).

Almost surely, 2^{1312120220331} is an apocalyptic number.

1312120220331 is a deficient number, since it is larger than the sum of its proper divisors (500915443029).

1312120220331 is a wasteful number, since it uses less digits than its factorization.

1312120220331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26788946.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1312120220331 its reverse (1330220212131), we get a palindrome (2642340432462).

The spelling of 1312120220331 in words is "one trillion, three hundred twelve billion, one hundred twenty million, two hundred twenty thousand, three hundred thirty-one".