1321321680440 has 64 divisors (see below), whose sum is σ = 2999492812800. Its totient is φ = 523822819968.

The previous prime is 1321321680433. The next prime is 1321321680451. The reversal of 1321321680440 is 440861231231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321321680440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4777871 + ... + 5046849.

It is an arithmetic number, because the mean of its divisors is an integer number (46867075200).

Almost surely, 2^{1321321680440} is an apocalyptic number.

1321321680440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321321680440 is an abundant number, since it is smaller than the sum of its proper divisors (1678171132360).

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

1321321680440 is a wasteful number, since it uses less digits than its factorization.

1321321680440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270084 (or 270080 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 1321321680440 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-one million, six hundred eighty thousand, four hundred forty".