1320221131221 has 4 divisors (see below), whose sum is σ = 1760294841632. Its totient is φ = 880147420812.

The previous prime is 1320221131199. The next prime is 1320221131247. The reversal of 1320221131221 is 1221311220231.

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 1320221131221 - 2⁵ = 1320221131189 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 (1320221181221) 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, 220036855201 + ... + 220036855206.

It is an arithmetic number, because the mean of its divisors is an integer number (440073710408).

Almost surely, 2^{1320221131221} is an apocalyptic number.

It is an amenable number.

1320221131221 is a deficient number, since it is larger than the sum of its proper divisors (440073710411).

1320221131221 is an equidigital number, since it uses as much as digits as its factorization.

1320221131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440073710410.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1320221131221 its reverse (1221311220231), we get a palindrome (2541532351452).

The spelling of 1320221131221 in words is "one trillion, three hundred twenty billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".