1312331201220 has 144 divisors (see below), whose sum is σ = 4004274415680. Its totient is φ = 320977433088.

The previous prime is 1312331201173. The next prime is 1312331201227. The reversal of 1312331201220 is 221021332131.

It is not an unprimeable number, because it can be changed into a prime (1312331201227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1179811 + ... + 2004149.

It is an arithmetic number, because the mean of its divisors is an integer number (27807461220).

Almost surely, 2^{1312331201220} is an apocalyptic number.

1312331201220 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 1312331201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2002137207840).

1312331201220 is an abundant number, since it is smaller than the sum of its proper divisors (2691943214460).

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

1312331201220 is a wasteful number, since it uses less digits than its factorization.

1312331201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824534 (or 824519 counting only the distinct ones).

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

Adding to 1312331201220 its reverse (221021332131), we get a palindrome (1533352533351).

The spelling of 1312331201220 in words is "one trillion, three hundred twelve billion, three hundred thirty-one million, two hundred one thousand, two hundred twenty".