1211121211031 has 2 divisors, whose sum is σ = 1211121211032. Its totient is φ = 1211121211030.

The previous prime is 1211121210961. The next prime is 1211121211051. The reversal of 1211121211031 is 1301121211121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1301121211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211121211031 - 2²² = 1211117016727 is a prime.

It is a super-2 number, since 2×1211121211031² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211121211051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605560605515 + 605560605516.

It is an arithmetic number, because the mean of its divisors is an integer number (605560605516).

Almost surely, 2^{1211121211031} is an apocalyptic number.

1211121211031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211121211031 is an equidigital number, since it uses as much as digits as its factorization.

1211121211031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1211121211031 its reverse (1301121211121), we get a palindrome (2512242422152).

The spelling of 1211121211031 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred eleven thousand, thirty-one".