312231211220 has 24 divisors (see below), whose sum is σ = 669636301824. Its totient is φ = 122235197216.

The previous prime is 312231211213. The next prime is 312231211241. The reversal of 312231211220 is 22112132213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 312231211192 and 312231211201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166079492 + ... + 166081371.

It is an arithmetic number, because the mean of its divisors is an integer number (27901512576).

Almost surely, 2^312231211220 is an apocalyptic number.

It is an amenable number.

312231211220 is an abundant number, since it is smaller than the sum of its proper divisors (357405090604).

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

312231211220 is a wasteful number, since it uses less digits than its factorization.

312231211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332160919 (or 332160917 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 312231211220 its reverse (22112132213), we get a palindrome (334343343433).

The spelling of 312231211220 in words is "three hundred twelve billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twenty".