212331312 has 30 divisors (see below), whose sum is σ = 594233172. Its totient is φ = 70777056.

The previous prime is 212331293. The next prime is 212331313. The reversal of 212331312 is 213133212.

212331312 is a `hidden beast` number, since 21 + 2 + 331 + 312 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (212331313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 737118 + ... + 737405.

Almost surely, 2^212331312 is an apocalyptic number.

It is an amenable number.

212331312 is an abundant number, since it is smaller than the sum of its proper divisors (381901860).

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

212331312 is a wasteful number, since it uses less digits than its factorization.

212331312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474537 (or 1474528 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 212331312 is about 14571.5926377318. The cubic root of 212331312 is about 596.5836511881.

Adding to 212331312 its reverse (213133212), we get a palindrome (425464524).

The spelling of 212331312 in words is "two hundred twelve million, three hundred thirty-one thousand, three hundred twelve".