12012213321 has 12 divisors (see below), whose sum is σ = 17545930740. Its totient is φ = 7918162560.

The previous prime is 12012213287. The next prime is 12012213361. The reversal of 12012213321 is 12331221021.

12012213321 is a `hidden beast` number, since 120 + 1 + 221 + 3 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6230892096 + 5781321225 = 78936^2 + 76035^2 .

It is not a de Polignac number, because 12012213321 - 2⁹ = 12012212809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12012213294 and 12012213303.

It is not an unprimeable number, because it can be changed into a prime (12012213361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7497460 + ... + 7499061.

It is an arithmetic number, because the mean of its divisors is an integer number (1462160895).

Almost surely, 2^12012213321 is an apocalyptic number.

It is an amenable number.

12012213321 is a deficient number, since it is larger than the sum of its proper divisors (5533717419).

12012213321 is a wasteful number, since it uses less digits than its factorization.

12012213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14996616 (or 14996613 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12012213321 its reverse (12331221021), we get a palindrome (24343434342).

The spelling of 12012213321 in words is "twelve billion, twelve million, two hundred thirteen thousand, three hundred twenty-one".