221110211101212 has 36 divisors (see below), whose sum is σ = 560906508258096. Its totient is φ = 73441114004160.

The previous prime is 221110211101193. The next prime is 221110211101243. The reversal of 221110211101212 is 212101112011122.

It is a happy number.

221110211101212 is a `hidden beast` number, since 221 + 1 + 10 + 211 + 10 + 1 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10928727088 + ... + 10928747319.

Almost surely, 2^{221110211101212} is an apocalyptic number.

It is an amenable number.

221110211101212 is an abundant number, since it is smaller than the sum of its proper divisors (339796297156884).

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

221110211101212 is a wasteful number, since it uses less digits than its factorization.

221110211101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21857474698 (or 21857474693 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221110211101212 its reverse (212101112011122), we get a palindrome (433211323112334).

The spelling of 221110211101212 in words is "two hundred twenty-one trillion, one hundred ten billion, two hundred eleven million, one hundred one thousand, two hundred twelve".