1211311323011 has 2 divisors, whose sum is σ = 1211311323012. Its totient is φ = 1211311323010.

The previous prime is 1211311322917. The next prime is 1211311323049. The reversal of 1211311323011 is 1103231131121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211311323011 is a prime.

It is a super-2 number, since 2×1211311323011² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1211311323091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605655661505 + 605655661506.

It is an arithmetic number, because the mean of its divisors is an integer number (605655661506).

Almost surely, 2^{1211311323011} is an apocalyptic number.

1211311323011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211311323011 is an equidigital number, since it uses as much as digits as its factorization.

1211311323011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 1211311323011 its reverse (1103231131121), we get a palindrome (2314542454132).

The spelling of 1211311323011 in words is "one trillion, two hundred eleven billion, three hundred eleven million, three hundred twenty-three thousand, eleven".