212220312 has 32 divisors (see below), whose sum is σ = 531469680. Its totient is φ = 70617600.

The previous prime is 212220259. The next prime is 212220313. The reversal of 212220312 is 213022212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 212220291 and 212220300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7068 + ... + 21780.

Almost surely, 2^212220312 is an apocalyptic number.

It is an amenable number.

212220312 is an abundant number, since it is smaller than the sum of its proper divisors (319249368).

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

212220312 is a wasteful number, since it uses less digits than its factorization.

212220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15323 (or 15319 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 212220312 is about 14567.7833591799. The cubic root of 212220312 is about 596.4796748011.

Adding to 212220312 its reverse (213022212), we get a palindrome (425242524).

The spelling of 212220312 in words is "two hundred twelve million, two hundred twenty thousand, three hundred twelve".