201211231310123 has 4 divisors (see below), whose sum is σ = 201211524018888. Its totient is φ = 201210938601360.

The previous prime is 201211231310077. The next prime is 201211231310129. The reversal of 201211231310123 is 321013132112102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201211231310123 - 2⁶ = 201211231310059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201211231310129) 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 in 3 ways as a sum of consecutive naturals, for example, 145320833 + ... + 146698898.

It is an arithmetic number, because the mean of its divisors is an integer number (50302881004722).

Almost surely, 2^{201211231310123} is an apocalyptic number.

201211231310123 is a deficient number, since it is larger than the sum of its proper divisors (292708765).

201211231310123 is an equidigital number, since it uses as much as digits as its factorization.

201211231310123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292708764.

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

Adding to 201211231310123 its reverse (321013132112102), we get a palindrome (522224363422225).

The spelling of 201211231310123 in words is "two hundred one trillion, two hundred eleven billion, two hundred thirty-one million, three hundred ten thousand, one hundred twenty-three".