1211323012311 has 16 divisors (see below), whose sum is σ = 1667368074240. Its totient is φ = 781418650560.

The previous prime is 1211323012261. The next prime is 1211323012313. The reversal of 1211323012311 is 1132103231121.

It is not a de Polignac number, because 1211323012311 - 2¹⁰ = 1211323011287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211323012313) 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 15 ways as a sum of consecutive naturals, for example, 252160 + ... + 1576778.

It is an arithmetic number, because the mean of its divisors is an integer number (104210504640).

Almost surely, 2^{1211323012311} is an apocalyptic number.

1211323012311 is a deficient number, since it is larger than the sum of its proper divisors (456045061929).

1211323012311 is a wasteful number, since it uses less digits than its factorization.

1211323012311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334486.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1211323012311 its reverse (1132103231121), we get a palindrome (2343426243432).

The spelling of 1211323012311 in words is "one trillion, two hundred eleven billion, three hundred twenty-three million, twelve thousand, three hundred eleven".