21112211121112 has 32 divisors (see below), whose sum is σ = 39891861072000. Its totient is φ = 10474526539264.

The previous prime is 21112211121101. The next prime is 21112211121119. The reversal of 21112211121112 is 21112111221112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21112211121112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112211121119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7899688 + ... + 10228855.

It is an arithmetic number, because the mean of its divisors is an integer number (1246620658500).

Almost surely, 2^{21112211121112} is an apocalyptic number.

It is an amenable number.

21112211121112 is a deficient number, since it is larger than the sum of its proper divisors (18779649950888).

21112211121112 is a wasteful number, since it uses less digits than its factorization.

21112211121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18129675 (or 18129671 counting only the distinct ones).

The product of its digits is 32, while the sum is 19.

Adding to 21112211121112 its reverse (21112111221112), we get a palindrome (42224322342224).

The spelling of 21112211121112 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twelve".