1312012121220 has 144 divisors (see below), whose sum is σ = 4156609504320. Its totient is φ = 334644127488.

The previous prime is 1312012121219. The next prime is 1312012121261. The reversal of 1312012121220 is 221212102131.

1312012121220 is a `hidden beast` number, since 1 + 31 + 201 + 212 + 1 + 220 = 666.

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 = 1312012121193 and 1312012121202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1276542 + ... + 2062421.

It is an arithmetic number, because the mean of its divisors is an integer number (28865343780).

Almost surely, 2^{1312012121220} is an apocalyptic number.

1312012121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312012121220 is an abundant number, since it is smaller than the sum of its proper divisors (2844597383100).

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

1312012121220 is a wasteful number, since it uses less digits than its factorization.

1312012121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3339074 (or 3339069 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1312012121220 its reverse (221212102131), we get a palindrome (1533224223351).

The spelling of 1312012121220 in words is "one trillion, three hundred twelve billion, twelve million, one hundred twenty-one thousand, two hundred twenty".