1312332131220 has 96 divisors (see below), whose sum is σ = 4010795260416. Its totient is φ = 317965161600.

The previous prime is 1312332131107. The next prime is 1312332131311. The reversal of 1312332131220 is 221312332131.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 646287 + ... + 1744233.

It is an arithmetic number, because the mean of its divisors is an integer number (41779117296).

Almost surely, 2^{1312332131220} is an apocalyptic number.

1312332131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312332131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2005397630208).

1312332131220 is an abundant number, since it is smaller than the sum of its proper divisors (2698463129196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312332131220 is a wasteful number, since it uses less digits than its factorization.

1312332131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099781 (or 1099779 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1312332131220 its reverse (221312332131), we get a palindrome (1533644463351).

The spelling of 1312332131220 in words is "one trillion, three hundred twelve billion, three hundred thirty-two million, one hundred thirty-one thousand, two hundred twenty".