211221101112 has 64 divisors (see below), whose sum is σ = 605454769920. Its totient is φ = 60152295168.

The previous prime is 211221101099. The next prime is 211221101137. The reversal of 211221101112 is 211101122112.

It is a happy number.

It is a super-2 number, since 2×211221101112² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221101091 and 211221101100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996093 + ... + 2099244.

It is an arithmetic number, because the mean of its divisors is an integer number (9460230780).

Almost surely, 2^211221101112 is an apocalyptic number.

It is an amenable number.

211221101112 is an abundant number, since it is smaller than the sum of its proper divisors (394233668808).

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

211221101112 is a wasteful number, since it uses less digits than its factorization.

211221101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095660 (or 4095656 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211221101112 its reverse (211101122112), we get a palindrome (422322223224).

The spelling of 211221101112 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred one thousand, one hundred twelve".