312012230220 has 216 divisors, whose sum is σ = 1002951077856. Its totient is φ = 78493764096.

The previous prime is 312012230191. The next prime is 312012230221. The reversal of 312012230220 is 22032210213.

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 = 312012230193 and 312012230202.

It is not an unprimeable number, because it can be changed into a prime (312012230221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6928617 + ... + 6973503.

Almost surely, 2^312012230220 is an apocalyptic number.

312012230220 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 312012230220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (501475538928).

312012230220 is an abundant number, since it is smaller than the sum of its proper divisors (690938847636).

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

312012230220 is a wasteful number, since it uses less digits than its factorization.

312012230220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45021 (or 44993 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 312012230220 its reverse (22032210213), we get a palindrome (334044440433).

The spelling of 312012230220 in words is "three hundred twelve billion, twelve million, two hundred thirty thousand, two hundred twenty".