1211232311123 has 2 divisors, whose sum is σ = 1211232311124. Its totient is φ = 1211232311122.

The previous prime is 1211232311117. The next prime is 1211232311153. The reversal of 1211232311123 is 3211132321121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211232311123 - 2¹⁸ = 1211232048979 is a prime.

It is a super-2 number, since 2×1211232311123² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211232311153) 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, 605616155561 + 605616155562.

It is an arithmetic number, because the mean of its divisors is an integer number (605616155562).

Almost surely, 2^{1211232311123} is an apocalyptic number.

1211232311123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211232311123 is an equidigital number, since it uses as much as digits as its factorization.

1211232311123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

Adding to 1211232311123 its reverse (3211132321121), we get a palindrome (4422364632244).

The spelling of 1211232311123 in words is "one trillion, two hundred eleven billion, two hundred thirty-two million, three hundred eleven thousand, one hundred twenty-three".