21111211112 has 64 divisors (see below), whose sum is σ = 41651712000. Its totient is φ = 10012178880.

The previous prime is 21111211111. The next prime is 21111211123.

21111211112 is nontrivially palindromic in base 10.

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 not an unprimeable number, because it can be changed into a prime (21111211111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13437287 + ... + 13438857.

It is an arithmetic number, because the mean of its divisors is an integer number (650808000).

Almost surely, 2^21111211112 is an apocalyptic number.

It is an amenable number.

21111211112 is a deficient number, since it is larger than the sum of its proper divisors (20540500888).

21111211112 is a wasteful number, since it uses less digits than its factorization.

21111211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2162 counting only the distinct ones).

The product of its digits is 8, while the sum is 14.

The spelling of 21111211112 in words is "twenty-one billion, one hundred eleven million, two hundred eleven thousand, one hundred twelve".