1312103121012 has 18 divisors (see below), whose sum is σ = 3316705111538. Its totient is φ = 437367706992.

The previous prime is 1312103121001. The next prime is 1312103121041. The reversal of 1312103121012 is 2101213012131.

1312103121012 is a `hidden beast` number, since 131 + 210 + 312 + 1 + 0 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 926976137616 + 385126983396 = 962796^2 + 620586^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1312103121012² (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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18223654423 + ... + 18223654494.

Almost surely, 2^{1312103121012} is an apocalyptic number.

1312103121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1312103121012 is an abundant number, since it is smaller than the sum of its proper divisors (2004601990526).

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

1312103121012 is a wasteful number, since it uses less digits than its factorization.

1312103121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36447308927 (or 36447308922 counting only the distinct ones).

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

Adding to 1312103121012 its reverse (2101213012131), we get a palindrome (3413316133143).

The spelling of 1312103121012 in words is "one trillion, three hundred twelve billion, one hundred three million, one hundred twenty-one thousand, twelve".