12021322121 has 6 divisors (see below), whose sum is σ = 12450145422. Its totient is φ = 11606792960.

The previous prime is 12021322111. The next prime is 12021322127. The reversal of 12021322121 is 12122312021.

It can be written as a sum of positive squares in 3 ways, for example, as 1399134025 + 10622188096 = 37405^2 + 103064^2 .

It is not a de Polignac number, because 12021322121 - 2¹⁰ = 12021321097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021322121.

It is not an unprimeable number, because it can be changed into a prime (12021322127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7146200 + ... + 7147881.

It is an arithmetic number, because the mean of its divisors is an integer number (2075024237).

Almost surely, 2^12021322121 is an apocalyptic number.

It is an amenable number.

12021322121 is a deficient number, since it is larger than the sum of its proper divisors (428823301).

12021322121 is an equidigital number, since it uses as much as digits as its factorization.

12021322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14294139 (or 14294110 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12021322121 its reverse (12122312021), we get a palindrome (24143634142).

The spelling of 12021322121 in words is "twelve billion, twenty-one million, three hundred twenty-two thousand, one hundred twenty-one".