12120121331 has 4 divisors (see below), whose sum is σ = 12647083152. Its totient is φ = 11593159512.

The previous prime is 12120121319. The next prime is 12120121333. The reversal of 12120121331 is 13312102121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12120121331 - 2⁶ = 12120121267 is a prime.

It is a super-2 number, since 2×12120121331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120121333) 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, 263480876 + ... + 263480921.

It is an arithmetic number, because the mean of its divisors is an integer number (3161770788).

Almost surely, 2^12120121331 is an apocalyptic number.

12120121331 is a deficient number, since it is larger than the sum of its proper divisors (526961821).

12120121331 is an equidigital number, since it uses as much as digits as its factorization.

12120121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526961820.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12120121331 its reverse (13312102121), we get a palindrome (25432223452).

The spelling of 12120121331 in words is "twelve billion, one hundred twenty million, one hundred twenty-one thousand, three hundred thirty-one".