1211211244123 has 16 divisors (see below), whose sum is σ = 1294720836480. Its totient is φ = 1129733676864.

The previous prime is 1211211244091. The next prime is 1211211244171. The reversal of 1211211244123 is 3214421121121.

It is a cyclic number.

It is not a de Polignac number, because 1211211244123 - 2⁵ = 1211211244091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211211244723) 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 in 15 ways as a sum of consecutive naturals, for example, 5340 + ... + 1556422.

It is an arithmetic number, because the mean of its divisors is an integer number (80920052280).

Almost surely, 2^{1211211244123} is an apocalyptic number.

1211211244123 is a deficient number, since it is larger than the sum of its proper divisors (83509592357).

1211211244123 is a wasteful number, since it uses less digits than its factorization.

1211211244123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551738.

The product of its digits is 768, while the sum is 25.

Adding to 1211211244123 its reverse (3214421121121), we get a palindrome (4425632365244).

The spelling of 1211211244123 in words is "one trillion, two hundred eleven billion, two hundred eleven million, two hundred forty-four thousand, one hundred twenty-three".