1311323031221 has 32 divisors (see below), whose sum is σ = 1539935063040. Its totient is φ = 1093255398144.

The previous prime is 1311323031149. The next prime is 1311323031241. The reversal of 1311323031221 is 1221303231131.

It is not a de Polignac number, because 1311323031221 - 2²² = 1311318836917 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 (1311323031241) 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 31 ways as a sum of consecutive naturals, for example, 159543650 + ... + 159551868.

It is an arithmetic number, because the mean of its divisors is an integer number (48122970720).

Almost surely, 2^{1311323031221} is an apocalyptic number.

It is an amenable number.

1311323031221 is a deficient number, since it is larger than the sum of its proper divisors (228612031819).

1311323031221 is a wasteful number, since it uses less digits than its factorization.

1311323031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10425.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1311323031221 its reverse (1221303231131), we get a palindrome (2532626262352).

The spelling of 1311323031221 in words is "one trillion, three hundred eleven billion, three hundred twenty-three million, thirty-one thousand, two hundred twenty-one".