12021322231 has 4 divisors (see below), whose sum is σ = 12185997952. Its totient is φ = 11856646512.

The previous prime is 12021322223. The next prime is 12021322267. The reversal of 12021322231 is 13222312021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12021322231 - 2³ = 12021322223 is a prime.

It is a super-2 number, since 2×12021322231² (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 = 12021322199 and 12021322208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021322031) 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 3 ways as a sum of consecutive naturals, for example, 82337751 + ... + 82337896.

It is an arithmetic number, because the mean of its divisors is an integer number (3046499488).

Almost surely, 2^12021322231 is an apocalyptic number.

12021322231 is a deficient number, since it is larger than the sum of its proper divisors (164675721).

12021322231 is an equidigital number, since it uses as much as digits as its factorization.

12021322231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164675720.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12021322231 its reverse (13222312021), we get a palindrome (25243634252).

The spelling of 12021322231 in words is "twelve billion, twenty-one million, three hundred twenty-two thousand, two hundred thirty-one".