1311423324221 has 2 divisors, whose sum is σ = 1311423324222. Its totient is φ = 1311423324220.

The previous prime is 1311423324209. The next prime is 1311423324229. The reversal of 1311423324221 is 1224233241131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1102678507225 + 208744816996 = 1050085^2 + 456886^2 .

It is an emirp because it is prime and its reverse (1224233241131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311423324221 - 2¹⁸ = 1311423062077 is a prime.

It is a super-2 number, since 2×1311423324221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311423324229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655711662110 + 655711662111.

It is an arithmetic number, because the mean of its divisors is an integer number (655711662111).

Almost surely, 2^{1311423324221} is an apocalyptic number.

It is an amenable number.

1311423324221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311423324221 is an equidigital number, since it uses as much as digits as its factorization.

1311423324221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

Adding to 1311423324221 its reverse (1224233241131), we get a palindrome (2535656565352).

The spelling of 1311423324221 in words is "one trillion, three hundred eleven billion, four hundred twenty-three million, three hundred twenty-four thousand, two hundred twenty-one".