12121323331 has 4 divisors (see below), whose sum is σ = 13053732832. Its totient is φ = 11188913832.

The previous prime is 12121323329. The next prime is 12121323337. The reversal of 12121323331 is 13332312121.

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 12121323331 - 2¹ = 12121323329 is a prime.

It is a super-2 number, since 2×12121323331² (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 (12121323337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466204731 + ... + 466204756.

It is an arithmetic number, because the mean of its divisors is an integer number (3263433208).

Almost surely, 2^12121323331 is an apocalyptic number.

12121323331 is a deficient number, since it is larger than the sum of its proper divisors (932409501).

12121323331 is an equidigital number, since it uses as much as digits as its factorization.

12121323331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932409500.

The product of its digits is 648, while the sum is 22.

Adding to 12121323331 its reverse (13332312121), we get a palindrome (25453635452).

The spelling of 12121323331 in words is "twelve billion, one hundred twenty-one million, three hundred twenty-three thousand, three hundred thirty-one".