12040330021 has 4 divisors (see below), whose sum is σ = 12045596992. Its totient is φ = 12035063052.

The previous prime is 12040329989. The next prime is 12040330031. The reversal of 12040330021 is 12003304021.

It is a happy number.

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 12040330021 - 2⁵ = 12040329989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12040329977 and 12040330004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12040330031) 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, 2630055 + ... + 2634628.

It is an arithmetic number, because the mean of its divisors is an integer number (3011399248).

Almost surely, 2^12040330021 is an apocalyptic number.

It is an amenable number.

12040330021 is a deficient number, since it is larger than the sum of its proper divisors (5266971).

12040330021 is an equidigital number, since it uses as much as digits as its factorization.

12040330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266970.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 12040330021 its reverse (12003304021), we get a palindrome (24043634042).

The spelling of 12040330021 in words is "twelve billion, forty million, three hundred thirty thousand, twenty-one".