1321340940643 has 8 divisors (see below), whose sum is σ = 1323146873360. Its totient is φ = 1319536124640.

The previous prime is 1321340940587. The next prime is 1321340940653. The reversal of 1321340940643 is 3460490431231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321340940643 - 2¹⁷ = 1321340809571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321340940596 and 1321340940605.

It is not an unprimeable number, because it can be changed into a prime (1321340940653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2102773 + ... + 2657881.

It is an arithmetic number, because the mean of its divisors is an integer number (165393359170).

Almost surely, 2^{1321340940643} is an apocalyptic number.

1321340940643 is a deficient number, since it is larger than the sum of its proper divisors (1805932717).

1321340940643 is a wasteful number, since it uses less digits than its factorization.

1321340940643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558357.

The product of its (nonzero) digits is 186624, while the sum is 40.

The spelling of 1321340940643 in words is "one trillion, three hundred twenty-one billion, three hundred forty million, nine hundred forty thousand, six hundred forty-three".