1321312344040 has 64 divisors (see below), whose sum is σ = 3304920245760. Its totient is φ = 472131452160.

The previous prime is 1321312344029. The next prime is 1321312344041. The reversal of 1321312344040 is 404432131231.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1321312344041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40967514 + ... + 40999753.

It is an arithmetic number, because the mean of its divisors is an integer number (51639378840).

Almost surely, 2^{1321312344040} is an apocalyptic number.

1321312344040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321312344040 is an abundant number, since it is smaller than the sum of its proper divisors (1983607901720).

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

1321312344040 is a wasteful number, since it uses less digits than its factorization.

1321312344040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81967322 (or 81967318 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1321312344040 its reverse (404432131231), we get a palindrome (1725744475271).

The spelling of 1321312344040 in words is "one trillion, three hundred twenty-one billion, three hundred twelve million, three hundred forty-four thousand, forty".