12123320440021 has 32 divisors (see below), whose sum is σ = 14095691366400. Its totient is φ = 10212520279680.

The previous prime is 12123320439913. The next prime is 12123320440037. The reversal of 12123320440021 is 12004402332121.

12123320440021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12123320440021 - 2²¹ = 12123318342869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123320440421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85237756 + ... + 85379866.

It is an arithmetic number, because the mean of its divisors is an integer number (440490355200).

Almost surely, 2^{12123320440021} is an apocalyptic number.

It is an amenable number.

12123320440021 is a deficient number, since it is larger than the sum of its proper divisors (1972370926379).

12123320440021 is a wasteful number, since it uses less digits than its factorization.

12123320440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142969.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 12123320440021 its reverse (12004402332121), we get a palindrome (24127722772142).

The spelling of 12123320440021 in words is "twelve trillion, one hundred twenty-three billion, three hundred twenty million, four hundred forty thousand, twenty-one".