12031923021 has 4 divisors (see below), whose sum is σ = 16042564032. Its totient is φ = 8021282012.

The previous prime is 12031923011. The next prime is 12031923023. The reversal of 12031923021 is 12032913021.

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 12031923021 - 2¹⁷ = 12031791949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12031922982 and 12031923000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031923023) 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, 2005320501 + ... + 2005320506.

It is an arithmetic number, because the mean of its divisors is an integer number (4010641008).

Almost surely, 2^12031923021 is an apocalyptic number.

It is an amenable number.

12031923021 is a deficient number, since it is larger than the sum of its proper divisors (4010641011).

12031923021 is an equidigital number, since it uses as much as digits as its factorization.

12031923021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010641010.

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 12031923021 in words is "twelve billion, thirty-one million, nine hundred twenty-three thousand, twenty-one".