123211231121 has 4 divisors (see below), whose sum is σ = 134412252144. Its totient is φ = 112010210100.

The previous prime is 123211231043. The next prime is 123211231153. The reversal of 123211231121 is 121132112321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123211231121 - 2¹⁰ = 123211230097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123211231093 and 123211231102.

It is not an unprimeable number, because it can be changed into a prime (123211231421) 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, 5600510495 + ... + 5600510516.

It is an arithmetic number, because the mean of its divisors is an integer number (33603063036).

Almost surely, 2^123211231121 is an apocalyptic number.

123211231121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123211231121 is a deficient number, since it is larger than the sum of its proper divisors (11201021023).

123211231121 is a wasteful number, since it uses less digits than its factorization.

123211231121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11201021022.

The product of its digits is 144, while the sum is 20.

Adding to 123211231121 its reverse (121132112321), we get a palindrome (244343343442).

The spelling of 123211231121 in words is "one hundred twenty-three billion, two hundred eleven million, two hundred thirty-one thousand, one hundred twenty-one".