1321312120 has 16 divisors (see below), whose sum is σ = 2972952360. Its totient is φ = 528524832.

The previous prime is 1321312103. The next prime is 1321312141. The reversal of 1321312120 is 212131231.

It is a junction number, because it is equal to n+sod(n) for n = 1321312094 and 1321312103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16516362 + ... + 16516441.

Almost surely, 2^1321312120 is an apocalyptic number.

1321312120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321312120 is an abundant number, since it is smaller than the sum of its proper divisors (1651640240).

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

1321312120 is a wasteful number, since it uses less digits than its factorization.

1321312120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33032814 (or 33032810 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321312120 is about 36349.8572211776. The cubic root of 1321312120 is about 1097.3246610472.

Adding to 1321312120 its reverse (212131231), we get a palindrome (1533443351).

The spelling of 1321312120 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, one hundred twenty".