1321311340241 has 4 divisors (see below), whose sum is σ = 1322322291312. Its totient is φ = 1320300389172.

The previous prime is 1321311340213. The next prime is 1321311340247. The reversal of 1321311340241 is 1420431131231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321311340241 - 2³⁴ = 1304131471057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321311340241.

It is not an unprimeable number, because it can be changed into a prime (1321311340247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505473575 + ... + 505476188.

It is an arithmetic number, because the mean of its divisors is an integer number (330580572828).

Almost surely, 2^{1321311340241} is an apocalyptic number.

It is an amenable number.

1321311340241 is a deficient number, since it is larger than the sum of its proper divisors (1010951071).

1321311340241 is a wasteful number, since it uses less digits than its factorization.

1321311340241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010951070.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1321311340241 its reverse (1420431131231), we get a palindrome (2741742471472).

The spelling of 1321311340241 in words is "one trillion, three hundred twenty-one billion, three hundred eleven million, three hundred forty thousand, two hundred forty-one".