1311301020221 has 2 divisors, whose sum is σ = 1311301020222. Its totient is φ = 1311301020220.

The previous prime is 1311301020217. The next prime is 1311301020277. The reversal of 1311301020221 is 1220201031131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290180211321 + 21120808900 = 1135861^2 + 145330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311301020221 - 2² = 1311301020217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311301020221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311301022221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655650510110 + 655650510111.

It is an arithmetic number, because the mean of its divisors is an integer number (655650510111).

Almost surely, 2^{1311301020221} is an apocalyptic number.

It is an amenable number.

1311301020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311301020221 is an equidigital number, since it uses as much as digits as its factorization.

1311301020221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1311301020221 its reverse (1220201031131), we get a palindrome (2531502051352).

The spelling of 1311301020221 in words is "one trillion, three hundred eleven billion, three hundred one million, twenty thousand, two hundred twenty-one".