212321312 has 36 divisors (see below), whose sum is σ = 486257310. Its totient is φ = 90994176.

The previous prime is 212321309. The next prime is 212321323. The reversal of 212321312 is 213123212.

212321312 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 175403536 + 36917776 = 13244^2 + 6076^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66137 + ... + 69272.

Almost surely, 2^212321312 is an apocalyptic number.

It is an amenable number.

212321312 is an abundant number, since it is smaller than the sum of its proper divisors (273935998).

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

212321312 is a wasteful number, since it uses less digits than its factorization.

212321312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135433 (or 135418 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 212321312 is about 14571.2495003002. The cubic root of 212321312 is about 596.5742854315.

Adding to 212321312 its reverse (213123212), we get a palindrome (425444524).

The spelling of 212321312 in words is "two hundred twelve million, three hundred twenty-one thousand, three hundred twelve".