12120001321 has 4 divisors (see below), whose sum is σ = 12121913044. Its totient is φ = 12118089600.

The previous prime is 12120001297. The next prime is 12120001429. The reversal of 12120001321 is 12310002121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12310002121 = 54437 ⋅226133.

It can be written as a sum of positive squares in 2 ways, for example, as 8832240400 + 3287760921 = 93980^2 + 57339^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120001321 - 2²⁹ = 11583130409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120001121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946320 + ... + 959041.

It is an arithmetic number, because the mean of its divisors is an integer number (3030478261).

Almost surely, 2^12120001321 is an apocalyptic number.

It is an amenable number.

12120001321 is a deficient number, since it is larger than the sum of its proper divisors (1911723).

12120001321 is an equidigital number, since it uses as much as digits as its factorization.

12120001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911722.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12120001321 its reverse (12310002121), we get a palindrome (24430003442).

The spelling of 12120001321 in words is "twelve billion, one hundred twenty million, one thousand, three hundred twenty-one".