12312021120 has 128 divisors (see below), whose sum is σ = 44850983040. Its totient is φ = 2814173184.

The previous prime is 12312021119. The next prime is 12312021131. The reversal of 12312021120 is 2112021321.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12312021120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444597 + ... + 471476.

It is an arithmetic number, because the mean of its divisors is an integer number (350398305).

Almost surely, 2^12312021120 is an apocalyptic number.

12312021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312021120 is an abundant number, since it is smaller than the sum of its proper divisors (32538961920).

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

12312021120 is an equidigital number, since it uses as much as digits as its factorization.

12312021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916102 (or 916090 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12312021120 its reverse (2112021321), we get a palindrome (14424042441).

The spelling of 12312021120 in words is "twelve billion, three hundred twelve million, twenty-one thousand, one hundred twenty".