12121321331 has 8 divisors (see below), whose sum is σ = 13874897664. Its totient is φ = 10373234760.

The previous prime is 12121321327. The next prime is 12121321357. The reversal of 12121321331 is 13312312121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12121321331 - 2² = 12121321327 is a prime.

It is a super-2 number, since 2×12121321331² (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 (12121321321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367705 + ... + 1376538.

It is an arithmetic number, because the mean of its divisors is an integer number (1734362208).

Almost surely, 2^12121321331 is an apocalyptic number.

12121321331 is a deficient number, since it is larger than the sum of its proper divisors (1753576333).

12121321331 is an equidigital number, since it uses as much as digits as its factorization.

12121321331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744881.

The product of its digits is 216, while the sum is 20.

Adding to 12121321331 its reverse (13312312121), we get a palindrome (25433633452).

The spelling of 12121321331 in words is "twelve billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred thirty-one".