221111220101212 has 24 divisors (see below), whose sum is σ = 443489553231200. Its totient is φ = 94490427251520.

The previous prime is 221111220101179. The next prime is 221111220101237. The reversal of 221111220101212 is 212101022111122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221111220101212.

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, 11313499239 + ... + 11313518782.

Almost surely, 2^{221111220101212} is an apocalyptic number.

It is an amenable number.

221111220101212 is an abundant number, since it is smaller than the sum of its proper divisors (222378333129988).

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

221111220101212 is a wasteful number, since it uses less digits than its factorization.

221111220101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22627018381 (or 22627018379 counting only the distinct ones).

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

Adding to 221111220101212 its reverse (212101022111122), we get a palindrome (433212242212334).

The spelling of 221111220101212 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twenty million, one hundred one thousand, two hundred twelve".