21211112112 has 20 divisors (see below), whose sum is σ = 54795373080.
Its totient is φ = 7070370688.
The previous prime is 21211112017. The next prime is 21211112147. The reversal of 21211112112 is 21121111212.
Adding to 21211112112 its reverse (21121111212), we get a palindrome (42332223324).
It is a happy number.
It is a super-2 number, since 2×212111121122 (a number of 21 digits) contains 22 as substring.
It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.
It is a junction number, because it is equal to n+sod(n) for n = 21211112091 and 21211112100.
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, 220949037 + ... + 220949132.
It is an arithmetic number, because the mean of its divisors is an integer number (2739768654).
Almost surely, 221211112112 is an apocalyptic number.
It is an amenable number.
21211112112 is an abundant number, since it is smaller than the sum of its proper divisors (33584260968).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21211112112 is a wasteful number, since it uses less digits than its factorization.
21211112112 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 441898180 (or 441898174 counting only the distinct ones).
The product of its digits is 16, while the sum is 15.
The spelling of 21211112112 in words is "twenty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred twelve".