12120213321 has 24 divisors (see below), whose sum is σ = 18010449600. Its totient is φ = 7848506016.

The previous prime is 12120213311. The next prime is 12120213323. The reversal of 12120213321 is 12331202121.

12120213321 is a `hidden beast` number, since 12 + 120 + 213 + 321 = 666.

It is not a de Polignac number, because 12120213321 - 2⁵ = 12120213289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12120213294 and 12120213303.

It is not an unprimeable number, because it can be changed into a prime (12120213323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169086 + ... + 229848.

It is an arithmetic number, because the mean of its divisors is an integer number (750435400).

Almost surely, 2^12120213321 is an apocalyptic number.

It is an amenable number.

12120213321 is a deficient number, since it is larger than the sum of its proper divisors (5890236279).

12120213321 is a wasteful number, since it uses less digits than its factorization.

12120213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61405 (or 61402 counting only the distinct ones).

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

Adding to 12120213321 its reverse (12331202121), we get a palindrome (24451415442).

The spelling of 12120213321 in words is "twelve billion, one hundred twenty million, two hundred thirteen thousand, three hundred twenty-one".