1321320402221 has 4 divisors (see below), whose sum is σ = 1352048783712. Its totient is φ = 1290592020732.

The previous prime is 1321320402217. The next prime is 1321320402263. The reversal of 1321320402221 is 1222040231231.

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 not a de Polignac number, because 1321320402221 - 2² = 1321320402217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321320405221) 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, 15364190681 + ... + 15364190766.

It is an arithmetic number, because the mean of its divisors is an integer number (338012195928).

Almost surely, 2^{1321320402221} is an apocalyptic number.

It is an amenable number.

1321320402221 is a deficient number, since it is larger than the sum of its proper divisors (30728381491).

1321320402221 is an equidigital number, since it uses as much as digits as its factorization.

1321320402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30728381490.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1321320402221 its reverse (1222040231231), we get a palindrome (2543360633452).

The spelling of 1321320402221 in words is "one trillion, three hundred twenty-one billion, three hundred twenty million, four hundred two thousand, two hundred twenty-one".