12321221031 has 12 divisors (see below), whose sum is σ = 20339793552. Its totient is φ = 7040697696.

The previous prime is 12321220997. The next prime is 12321221069. The reversal of 12321221031 is 13012212321.

It is not a de Polignac number, because 12321221031 - 2²² = 12317026727 is a prime.

It is a super-2 number, since 2×12321221031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12321220995 and 12321221013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321221431) 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, 97787406 + ... + 97787531.

It is an arithmetic number, because the mean of its divisors is an integer number (1694982796).

Almost surely, 2^12321221031 is an apocalyptic number.

12321221031 is a deficient number, since it is larger than the sum of its proper divisors (8018572521).

12321221031 is a wasteful number, since it uses less digits than its factorization.

12321221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195574950 (or 195574947 counting only the distinct ones).

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

Adding to 12321221031 its reverse (13012212321), we get a palindrome (25333433352).

The spelling of 12321221031 in words is "twelve billion, three hundred twenty-one million, two hundred twenty-one thousand, thirty-one".