21211221112 has 16 divisors (see below), whose sum is σ = 39783837600. Its totient is φ = 10602197760.

The previous prime is 21211221089. The next prime is 21211221167. The reversal of 21211221112 is 21112211212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400089 + ... + 449992.

It is an arithmetic number, because the mean of its divisors is an integer number (2486489850).

Almost surely, 2^21211221112 is an apocalyptic number.

It is an amenable number.

21211221112 is a deficient number, since it is larger than the sum of its proper divisors (18572616488).

21211221112 is a wasteful number, since it uses less digits than its factorization.

21211221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853206 (or 853202 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 21211221112 its reverse (21112211212), we get a palindrome (42323432324).

The spelling of 21211221112 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twelve".