221110221121212 has 24 divisors (see below), whose sum is σ = 518082526483200. Its totient is φ = 73395024583216.

The previous prime is 221110221121189. The next prime is 221110221121219. The reversal of 221110221121212 is 212121122011122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221110221121219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38547804162 + ... + 38547809897.

It is an arithmetic number, because the mean of its divisors is an integer number (21586771936800).

Almost surely, 2^{221110221121212} is an apocalyptic number.

It is an amenable number.

221110221121212 is an abundant number, since it is smaller than the sum of its proper divisors (296972305361988).

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

221110221121212 is a wasteful number, since it uses less digits than its factorization.

221110221121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77095614305 (or 77095614303 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221110221121212 its reverse (212121122011122), we get a palindrome (433231343132334).

The spelling of 221110221121212 in words is "two hundred twenty-one trillion, one hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".