12321021021 has 24 divisors (see below), whose sum is σ = 17083332864. Its totient is φ = 7890707520.

The previous prime is 12321021019. The next prime is 12321021043. The reversal of 12321021021 is 12012012321.

It is not a de Polignac number, because 12321021021 - 2¹ = 12321021019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321021521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1793425 + ... + 1800281.

It is an arithmetic number, because the mean of its divisors is an integer number (711805536).

Almost surely, 2^12321021021 is an apocalyptic number.

It is an amenable number.

12321021021 is a deficient number, since it is larger than the sum of its proper divisors (4762311843).

12321021021 is an equidigital number, since it uses as much as digits as its factorization.

12321021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7169 (or 7030 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12321021021 its reverse (12012012321), we get a palindrome (24333033342).

The spelling of 12321021021 in words is "twelve billion, three hundred twenty-one million, twenty-one thousand, twenty-one".