1211323213127 has 2 divisors, whose sum is σ = 1211323213128. Its totient is φ = 1211323213126.

The previous prime is 1211323213117. The next prime is 1211323213153. The reversal of 1211323213127 is 7213123231121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211323213127 - 2¹⁸ = 1211322950983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211323213127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211323213117) 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 as a sum of consecutive naturals, namely, 605661606563 + 605661606564.

It is an arithmetic number, because the mean of its divisors is an integer number (605661606564).

Almost surely, 2^{1211323213127} is an apocalyptic number.

1211323213127 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211323213127 is an equidigital number, since it uses as much as digits as its factorization.

1211323213127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

Adding to 1211323213127 its reverse (7213123231121), we get a palindrome (8424446444248).

The spelling of 1211323213127 in words is "one trillion, two hundred eleven billion, three hundred twenty-three million, two hundred thirteen thousand, one hundred twenty-seven".