1313121323221 has 4 divisors (see below), whose sum is σ = 1319009759872. Its totient is φ = 1307232886572.

The previous prime is 1313121323201. The next prime is 1313121323279. The reversal of 1313121323221 is 1223231213131.

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 1313121323221 - 2¹⁹ = 1313120798933 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 (1313121323201) 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, 2944217991 + ... + 2944218436.

It is an arithmetic number, because the mean of its divisors is an integer number (329752439968).

Almost surely, 2^{1313121323221} is an apocalyptic number.

It is an amenable number.

1313121323221 is a deficient number, since it is larger than the sum of its proper divisors (5888436651).

1313121323221 is an equidigital number, since it uses as much as digits as its factorization.

1313121323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5888436650.

The product of its digits is 1296, while the sum is 25.

Adding to 1313121323221 its reverse (1223231213131), we get a palindrome (2536352536352).

The spelling of 1313121323221 in words is "one trillion, three hundred thirteen billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".