12320021331 has 24 divisors (see below), whose sum is σ = 17936871264. Its totient is φ = 8148216960.

The previous prime is 12320021327. The next prime is 12320021341. The reversal of 12320021331 is 13312002321.

12320021331 is a `hidden beast` number, since 12 + 320 + 0 + 2 + 1 + 331 = 666.

It is not a de Polignac number, because 12320021331 - 2² = 12320021327 is a prime.

It is a super-2 number, since 2×12320021331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12320021341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3557941 + ... + 3561401.

It is an arithmetic number, because the mean of its divisors is an integer number (747369636).

Almost surely, 2^12320021331 is an apocalyptic number.

12320021331 is a deficient number, since it is larger than the sum of its proper divisors (5616849933).

12320021331 is a wasteful number, since it uses less digits than its factorization.

12320021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6491 (or 6488 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 12320021331 its reverse (13312002321), we get a palindrome (25632023652).

The spelling of 12320021331 in words is "twelve billion, three hundred twenty million, twenty-one thousand, three hundred thirty-one".