12320121021 has 16 divisors (see below), whose sum is σ = 17914364160. Its totient is φ = 7485641280.

The previous prime is 12320120993. The next prime is 12320121031. The reversal of 12320121021 is 12012102321.

It is not a de Polignac number, because 12320121021 - 2⁹ = 12320120509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320121031) 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, 1996290 + ... + 2002451.

It is an arithmetic number, because the mean of its divisors is an integer number (1119647760).

Almost surely, 2^12320121021 is an apocalyptic number.

It is an amenable number.

12320121021 is a deficient number, since it is larger than the sum of its proper divisors (5594243139).

12320121021 is a wasteful number, since it uses less digits than its factorization.

12320121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998836.

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

Adding to 12320121021 its reverse (12012102321), we get a palindrome (24332223342).

The spelling of 12320121021 in words is "twelve billion, three hundred twenty million, one hundred twenty-one thousand, twenty-one".