12121304331 has 4 divisors (see below), whose sum is σ = 16161739112. Its totient is φ = 8080869552.

The previous prime is 12121304311. The next prime is 12121304333. The reversal of 12121304331 is 13340312121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13340312121 = 3 ⋅4446770707.

It is not a de Polignac number, because 12121304331 - 2¹³ = 12121296139 is a prime.

It is a super-2 number, since 2×12121304331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121304298 and 12121304307.

It is not an unprimeable number, because it can be changed into a prime (12121304333) 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, 2020217386 + ... + 2020217391.

It is an arithmetic number, because the mean of its divisors is an integer number (4040434778).

Almost surely, 2^12121304331 is an apocalyptic number.

12121304331 is a deficient number, since it is larger than the sum of its proper divisors (4040434781).

12121304331 is an equidigital number, since it uses as much as digits as its factorization.

12121304331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040434780.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 12121304331 its reverse (13340312121), we get a palindrome (25461616452).

The spelling of 12121304331 in words is "twelve billion, one hundred twenty-one million, three hundred four thousand, three hundred thirty-one".