212021312 has 14 divisors (see below), whose sum is σ = 420729918. Its totient is φ = 106010624.

The previous prime is 212021311. The next prime is 212021333. The reversal of 212021312 is 213120212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 116294656 + 95726656 = 10784^2 + 9784^2 .

It is not an unprimeable number, because it can be changed into a prime (212021311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1656353 + ... + 1656480.

It is an arithmetic number, because the mean of its divisors is an integer number (30052137).

Almost surely, 2^212021312 is an apocalyptic number.

It is an amenable number.

212021312 is a deficient number, since it is larger than the sum of its proper divisors (208708606).

212021312 is an equidigital number, since it uses as much as digits as its factorization.

212021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312845 (or 3312835 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 212021312 is about 14560.9516172536. The cubic root of 212021312 is about 596.2931758821.

Adding to 212021312 its reverse (213120212), we get a palindrome (425141524).

It can be divided in two parts, 2120 and 21312, that added together give a palindrome (23432).

The spelling of 212021312 in words is "two hundred twelve million, twenty-one thousand, three hundred twelve".