312023321220 has 96 divisors (see below), whose sum is σ = 941326057728. Its totient is φ = 76768538112.

The previous prime is 312023321213. The next prime is 312023321231. The reversal of 312023321220 is 22123320213.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1532022 + ... + 1723698.

It is an arithmetic number, because the mean of its divisors is an integer number (9805479768).

Almost surely, 2^312023321220 is an apocalyptic number.

312023321220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 312023321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (470663028864).

312023321220 is an abundant number, since it is smaller than the sum of its proper divisors (629302736508).

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

312023321220 is a wasteful number, since it uses less digits than its factorization.

312023321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193789 (or 193787 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 312023321220 its reverse (22123320213), we get a palindrome (334146641433).

The spelling of 312023321220 in words is "three hundred twelve billion, twenty-three million, three hundred twenty-one thousand, two hundred twenty".