1311300311221 has 4 divisors (see below), whose sum is σ = 1311302613600. Its totient is φ = 1311298008844.

The previous prime is 1311300311213. The next prime is 1311300311309. The reversal of 1311300311221 is 1221130031131.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1311300311221 - 2³ = 1311300311213 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 (1311300311821) 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, 398520 + ... + 1667758.

It is an arithmetic number, because the mean of its divisors is an integer number (327825653400).

Almost surely, 2^{1311300311221} is an apocalyptic number.

It is an amenable number.

1311300311221 is a deficient number, since it is larger than the sum of its proper divisors (2302379).

1311300311221 is a wasteful number, since it uses less digits than its factorization.

1311300311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302378.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1311300311221 its reverse (1221130031131), we get a palindrome (2532430342352).

The spelling of 1311300311221 in words is "one trillion, three hundred eleven billion, three hundred million, three hundred eleven thousand, two hundred twenty-one".