1321331342144 has 56 divisors (see below), whose sum is σ = 2861155210368. Its totient is φ = 600442813440.

The previous prime is 1321331342129. The next prime is 1321331342161. The reversal of 1321331342144 is 4412431331231.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1321331342144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2372012 + ... + 2875604.

It is an arithmetic number, because the mean of its divisors is an integer number (51092057328).

Almost surely, 2^{1321331342144} is an apocalyptic number.

It is an amenable number.

1321331342144 is an abundant number, since it is smaller than the sum of its proper divisors (1539823868224).

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

1321331342144 is a wasteful number, since it uses less digits than its factorization.

1321331342144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507343 (or 507333 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

Adding to 1321331342144 its reverse (4412431331231), we get a palindrome (5733762673375).

The spelling of 1321331342144 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-one million, three hundred forty-two thousand, one hundred forty-four".