12031123211021 has 4 divisors (see below), whose sum is σ = 12310916774112. Its totient is φ = 11751329647932.

The previous prime is 12031123210879. The next prime is 12031123211027. The reversal of 12031123211021 is 12011232113021.

12031123211021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12031123211021 - 2³⁸ = 11756245304077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12031123210984 and 12031123211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031123211027) 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, 139896781481 + ... + 139896781566.

It is an arithmetic number, because the mean of its divisors is an integer number (3077729193528).

Almost surely, 2^{12031123211021} is an apocalyptic number.

It is an amenable number.

12031123211021 is a deficient number, since it is larger than the sum of its proper divisors (279793563091).

12031123211021 is an equidigital number, since it uses as much as digits as its factorization.

12031123211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279793563090.

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

Adding to 12031123211021 its reverse (12011232113021), we get a palindrome (24042355324042).

The spelling of 12031123211021 in words is "twelve trillion, thirty-one billion, one hundred twenty-three million, two hundred eleven thousand, twenty-one".