1321120311012 has 36 divisors (see below), whose sum is σ = 3515261648080. Its totient is φ = 417195887472.

The previous prime is 1321120310981. The next prime is 1321120311047. The reversal of 1321120311012 is 2101130211231.

1321120311012 is a `hidden beast` number, since 1 + 321 + 1 + 20 + 311 + 0 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 965730538 + ... + 965731905.

Almost surely, 2^{1321120311012} is an apocalyptic number.

1321120311012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321120311012 is an abundant number, since it is smaller than the sum of its proper divisors (2194141337068).

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

1321120311012 is a wasteful number, since it uses less digits than its factorization.

1321120311012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931462472 (or 1931462467 counting only the distinct ones).

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

Adding to 1321120311012 its reverse (2101130211231), we get a palindrome (3422250522243).

The spelling of 1321120311012 in words is "one trillion, three hundred twenty-one billion, one hundred twenty million, three hundred eleven thousand, twelve".