1312103111220 has 72 divisors (see below), whose sum is σ = 4341868483680. Its totient is φ = 318085602240.

The previous prime is 1312103111191. The next prime is 1312103111239. The reversal of 1312103111220 is 221113012131.

1312103111220 is a `hidden beast` number, since 1 + 312 + 10 + 311 + 12 + 20 = 666.

It is a super-2 number, since 2×1312103111220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1312103111193 and 1312103111202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 331337190 + ... + 331341149.

It is an arithmetic number, because the mean of its divisors is an integer number (60303728940).

Almost surely, 2^{1312103111220} is an apocalyptic number.

1312103111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312103111220 is an abundant number, since it is smaller than the sum of its proper divisors (3029765372460).

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

1312103111220 is a wasteful number, since it uses less digits than its factorization.

1312103111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662678365 (or 662678360 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1312103111220 its reverse (221113012131), we get a palindrome (1533216123351).

The spelling of 1312103111220 in words is "one trillion, three hundred twelve billion, one hundred three million, one hundred eleven thousand, two hundred twenty".