12123221331 has 16 divisors (see below), whose sum is σ = 17438220800. Its totient is φ = 7447364640.

The previous prime is 12123221323. The next prime is 12123221359. The reversal of 12123221331 is 13312232121.

It is not a de Polignac number, because 12123221331 - 2³ = 12123221323 is a prime.

It is a super-2 number, since 2×12123221331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12123221298 and 12123221307.

It is not an unprimeable number, because it can be changed into a prime (12123221371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249931 + ... + 294468.

It is an arithmetic number, because the mean of its divisors is an integer number (1089888800).

Almost surely, 2^12123221331 is an apocalyptic number.

12123221331 is a deficient number, since it is larger than the sum of its proper divisors (5314999469).

12123221331 is a wasteful number, since it uses less digits than its factorization.

12123221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544986.

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

Adding to 12123221331 its reverse (13312232121), we get a palindrome (25435453452).

The spelling of 12123221331 in words is "twelve billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred thirty-one".