1211320331113 has 2 divisors, whose sum is σ = 1211320331114. Its totient is φ = 1211320331112.

The previous prime is 1211320331107. The next prime is 1211320331153. The reversal of 1211320331113 is 3111330231121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1004539139289 + 206781191824 = 1002267^2 + 454732^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211320331113 - 2²⁵ = 1211286776681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211320331153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605660165556 + 605660165557.

It is an arithmetic number, because the mean of its divisors is an integer number (605660165557).

Almost surely, 2^{1211320331113} is an apocalyptic number.

It is an amenable number.

1211320331113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211320331113 is an equidigital number, since it uses as much as digits as its factorization.

1211320331113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1211320331113 its reverse (3111330231121), we get a palindrome (4322650562234).

The spelling of 1211320331113 in words is "one trillion, two hundred eleven billion, three hundred twenty million, three hundred thirty-one thousand, one hundred thirteen".