1321320203441 has 16 divisors (see below), whose sum is σ = 1515011552256. Its totient is φ = 1128864186576.

The previous prime is 1321320203429. The next prime is 1321320203447. The reversal of 1321320203441 is 1443020231231.

It is a de Polignac number, because none of the positive numbers 2^k-1321320203441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321320203441.

It is not an unprimeable number, because it can be changed into a prime (1321320203447) 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, 6326810 + ... + 6532316.

It is an arithmetic number, because the mean of its divisors is an integer number (94688222016).

Almost surely, 2^{1321320203441} is an apocalyptic number.

It is an amenable number.

1321320203441 is a deficient number, since it is larger than the sum of its proper divisors (193691348815).

1321320203441 is a wasteful number, since it uses less digits than its factorization.

1321320203441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208508.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1321320203441 its reverse (1443020231231), we get a palindrome (2764340434672).

The spelling of 1321320203441 in words is "one trillion, three hundred twenty-one billion, three hundred twenty million, two hundred three thousand, four hundred forty-one".