12311221032 has 48 divisors (see below), whose sum is σ = 36374064480. Its totient is φ = 3730672800.

The previous prime is 12311221001. The next prime is 12311221033. The reversal of 12311221032 is 23012211321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12311220996 and 12311221014.

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 11 ways as a sum of consecutive naturals, for example, 7771444 + ... + 7773027.

It is an arithmetic number, because the mean of its divisors is an integer number (757793010).

Almost surely, 2^12311221032 is an apocalyptic number.

12311221032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12311221032 is an abundant number, since it is smaller than the sum of its proper divisors (24062843448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12311221032 is a wasteful number, since it uses less digits than its factorization.

12311221032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15544494 (or 15544487 counting only the distinct ones).

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

Adding to 12311221032 its reverse (23012211321), we get a palindrome (35323432353).

The spelling of 12311221032 in words is "twelve billion, three hundred eleven million, two hundred twenty-one thousand, thirty-two".