12001323021 has 16 divisors (see below), whose sum is σ = 16308682560. Its totient is φ = 7847515520.

The previous prime is 12001322989. The next prime is 12001323031. The reversal of 12001323021 is 12032310021.

It is a cyclic number.

It is not a de Polignac number, because 12001323021 - 2⁵ = 12001322989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001323031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615106 + ... + 634316.

It is an arithmetic number, because the mean of its divisors is an integer number (1019292660).

Almost surely, 2^12001323021 is an apocalyptic number.

It is an amenable number.

12001323021 is a deficient number, since it is larger than the sum of its proper divisors (4307359539).

12001323021 is a wasteful number, since it uses less digits than its factorization.

12001323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23196.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 12001323021 its reverse (12032310021), we get a palindrome (24033633042).

The spelling of 12001323021 in words is "twelve billion, one million, three hundred twenty-three thousand, twenty-one".