12311221031 has 8 divisors (see below), whose sum is σ = 12584411904. Its totient is φ = 12038499000.

The previous prime is 12311221001. The next prime is 12311221033. The reversal of 12311221031 is 13012211321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12311221031 is a prime.

It is a super-2 number, since 2×12311221031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311221033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63845 + ... + 169406.

It is an arithmetic number, because the mean of its divisors is an integer number (1573051488).

Almost surely, 2^12311221031 is an apocalyptic number.

12311221031 is a deficient number, since it is larger than the sum of its proper divisors (273190873).

12311221031 is a wasteful number, since it uses less digits than its factorization.

12311221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234421.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12311221031 its reverse (13012211321), we get a palindrome (25323432352).

The spelling of 12311221031 in words is "twelve billion, three hundred eleven million, two hundred twenty-one thousand, thirty-one".