321220212 has 12 divisors (see below), whose sum is σ = 749513856. Its totient is φ = 107073400.

The previous prime is 321220187. The next prime is 321220217. The reversal of 321220212 is 212022123.

It is a happy number.

321220212 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

321220212 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 321220191 and 321220200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321220217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13384164 + ... + 13384187.

It is an arithmetic number, because the mean of its divisors is an integer number (62459488).

Almost surely, 2^321220212 is an apocalyptic number.

It is an amenable number.

321220212 is an abundant number, since it is smaller than the sum of its proper divisors (428293644).

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

321220212 is a wasteful number, since it uses less digits than its factorization.

321220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26768358 (or 26768356 counting only the distinct ones).

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

The square root of 321220212 is about 17922.6173311824. The cubic root of 321220212 is about 684.8586647862.

Adding to 321220212 its reverse (212022123), we get a palindrome (533242335).

The spelling of 321220212 in words is "three hundred twenty-one million, two hundred twenty thousand, two hundred twelve".