211221110120212 has 24 divisors (see below), whose sum is σ = 370094266745280. Its totient is φ = 105479935370880.

The previous prime is 211221110120177. The next prime is 211221110120309. The reversal of 211221110120212 is 212021011122112.

It is a happy number.

It is a super-2 number, since 2×211221110120212² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221110120212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13535964 + ... + 24610252.

It is an arithmetic number, because the mean of its divisors is an integer number (15420594447720).

Almost surely, 2^{211221110120212} is an apocalyptic number.

It is an amenable number.

211221110120212 is a deficient number, since it is larger than the sum of its proper divisors (158873156625068).

211221110120212 is a wasteful number, since it uses less digits than its factorization.

211221110120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11080191 (or 11080189 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221110120212 its reverse (212021011122112), we get a palindrome (423242121242324).

The spelling of 211221110120212 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred ten million, one hundred twenty thousand, two hundred twelve".