1321110313221 has 4 divisors (see below), whose sum is σ = 1761480417632. Its totient is φ = 880740208812.

The previous prime is 1321110313183. The next prime is 1321110313249. The reversal of 1321110313221 is 1223130111231.

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 1321110313221 - 2²⁷ = 1320976095493 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 (1321110313321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220185052201 + ... + 220185052206.

It is an arithmetic number, because the mean of its divisors is an integer number (440370104408).

Almost surely, 2^{1321110313221} is an apocalyptic number.

It is an amenable number.

1321110313221 is a deficient number, since it is larger than the sum of its proper divisors (440370104411).

1321110313221 is an equidigital number, since it uses as much as digits as its factorization.

1321110313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440370104410.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1321110313221 its reverse (1223130111231), we get a palindrome (2544240424452).

The spelling of 1321110313221 in words is "one trillion, three hundred twenty-one billion, one hundred ten million, three hundred thirteen thousand, two hundred twenty-one".