1323121310221 has 4 divisors (see below), whose sum is σ = 1345547095200. Its totient is φ = 1300695525244.

The previous prime is 1323121310209. The next prime is 1323121310249. The reversal of 1323121310221 is 1220131213231.

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 1323121310221 - 2¹⁵ = 1323121277453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323121310192 and 1323121310201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323121310261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11212892401 + ... + 11212892518.

It is an arithmetic number, because the mean of its divisors is an integer number (336386773800).

Almost surely, 2^{1323121310221} is an apocalyptic number.

It is an amenable number.

1323121310221 is a deficient number, since it is larger than the sum of its proper divisors (22425784979).

1323121310221 is an equidigital number, since it uses as much as digits as its factorization.

1323121310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22425784978.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1323121310221 its reverse (1220131213231), we get a palindrome (2543252523452).

The spelling of 1323121310221 in words is "one trillion, three hundred twenty-three billion, one hundred twenty-one million, three hundred ten thousand, two hundred twenty-one".