12123000921 has 4 divisors (see below), whose sum is σ = 16164001232. Its totient is φ = 8082000612.

The previous prime is 12123000913. The next prime is 12123000947. The reversal of 12123000921 is 12900032121.

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 not a de Polignac number, because 12123000921 - 2³ = 12123000913 is a prime.

It is the 110105-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12123000961) by changing a digit.

It is a nontrivial repunit in base 110104.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020500151 + ... + 2020500156.

It is an arithmetic number, because the mean of its divisors is an integer number (4041000308).

Almost surely, 2^12123000921 is an apocalyptic number.

It is an amenable number.

12123000921 is a deficient number, since it is larger than the sum of its proper divisors (4041000311).

12123000921 is an equidigital number, since it uses as much as digits as its factorization.

12123000921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041000310.

The product of its (nonzero) digits is 216, while the sum is 21.

The spelling of 12123000921 in words is "twelve billion, one hundred twenty-three million, nine hundred twenty-one", and thus it is an aban number.