221030312212 has 6 divisors (see below), whose sum is σ = 386803046378. Its totient is φ = 110515156104.

The previous prime is 221030312203. The next prime is 221030312231. The reversal of 221030312212 is 212213030122.

It can be written as a sum of positive squares in only one way, i.e., 220821047056 + 209265156 = 469916^2 + 14466^2 .

It is a super-3 number, since 3×221030312212³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221030312212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27628789023 + ... + 27628789030.

Almost surely, 2^221030312212 is an apocalyptic number.

It is an amenable number.

221030312212 is a deficient number, since it is larger than the sum of its proper divisors (165772734166).

221030312212 is a wasteful number, since it uses less digits than its factorization.

221030312212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55257578057 (or 55257578055 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221030312212 its reverse (212213030122), we get a palindrome (433243342334).

The spelling of 221030312212 in words is "two hundred twenty-one billion, thirty million, three hundred twelve thousand, two hundred twelve".