1321223301221 has 4 divisors (see below), whose sum is σ = 1363843407744. Its totient is φ = 1278603194700.

The previous prime is 1321223301179. The next prime is 1321223301239. The reversal of 1321223301221 is 1221033221231.

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 1321223301221 - 2⁶ = 1321223301157 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 (1321223301271) 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, 21310053215 + ... + 21310053276.

It is an arithmetic number, because the mean of its divisors is an integer number (340960851936).

Almost surely, 2^{1321223301221} is an apocalyptic number.

It is an amenable number.

1321223301221 is a deficient number, since it is larger than the sum of its proper divisors (42620106523).

1321223301221 is an equidigital number, since it uses as much as digits as its factorization.

1321223301221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42620106522.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1321223301221 its reverse (1221033221231), we get a palindrome (2542256522452).

It can be divided in two parts, 132122 and 3301221, that added together give a palindrome (3433343).

The spelling of 1321223301221 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-three million, three hundred one thousand, two hundred twenty-one".