1211331232123 has 4 divisors (see below), whose sum is σ = 1253101274640. Its totient is φ = 1169561189608.

The previous prime is 1211331232057. The next prime is 1211331232129. The reversal of 1211331232123 is 3212321331121.

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 1211331232123 - 2²⁵ = 1211297677691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211331232129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20885021215 + ... + 20885021272.

It is an arithmetic number, because the mean of its divisors is an integer number (313275318660).

Almost surely, 2^{1211331232123} is an apocalyptic number.

1211331232123 is a deficient number, since it is larger than the sum of its proper divisors (41770042517).

1211331232123 is an equidigital number, since it uses as much as digits as its factorization.

1211331232123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41770042516.

The product of its digits is 1296, while the sum is 25.

Adding to 1211331232123 its reverse (3212321331121), we get a palindrome (4423652563244).

The spelling of 1211331232123 in words is "one trillion, two hundred eleven billion, three hundred thirty-one million, two hundred thirty-two thousand, one hundred twenty-three".