21120112012 has 12 divisors (see below), whose sum is σ = 37040373216. Its totient is φ = 10537148240.

The previous prime is 21120112009. The next prime is 21120112033. The reversal of 21120112012 is 21021102112.

It is a junction number, because it is equal to n+sod(n) for n = 21120111983 and 21120112001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5724868 + ... + 5728555.

It is an arithmetic number, because the mean of its divisors is an integer number (3086697768).

Almost surely, 2^21120112012 is an apocalyptic number.

It is an amenable number.

21120112012 is a deficient number, since it is larger than the sum of its proper divisors (15920261204).

21120112012 is a wasteful number, since it uses less digits than its factorization.

21120112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11453888 (or 11453886 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120112012 its reverse (21021102112), we get a palindrome (42141214124).

The spelling of 21120112012 in words is "twenty-one billion, one hundred twenty million, one hundred twelve thousand, twelve".