1312311331220 has 48 divisors (see below), whose sum is σ = 2763414435600. Its totient is φ = 523484881920.

The previous prime is 1312311331187. The next prime is 1312311331231. The reversal of 1312311331220 is 221331132131.

It can be written as a sum of positive squares in 8 ways, for example, as 60199566736 + 1252111764484 = 245356^2 + 1118978^2 .

It is a super-2 number, since 2×1312311331220² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62299490 + ... + 62320550.

It is an arithmetic number, because the mean of its divisors is an integer number (57571134075).

Almost surely, 2^{1312311331220} is an apocalyptic number.

1312311331220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312311331220 is an abundant number, since it is smaller than the sum of its proper divisors (1451103104380).

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

1312311331220 is a wasteful number, since it uses less digits than its factorization.

1312311331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29468 (or 29466 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1312311331220 its reverse (221331132131), we get a palindrome (1533642463351).

The spelling of 1312311331220 in words is "one trillion, three hundred twelve billion, three hundred eleven million, three hundred thirty-one thousand, two hundred twenty".