21112112012 has 18 divisors (see below), whose sum is σ = 37315693884. Its totient is φ = 10451520400.

The previous prime is 21112111987. The next prime is 21112112039. The reversal of 21112112012 is 21021121112.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217898 + ... + 299505.

Almost surely, 2^21112112012 is an apocalyptic number.

It is an amenable number.

21112112012 is a deficient number, since it is larger than the sum of its proper divisors (16203581872).

21112112012 is a wasteful number, since it uses less digits than its factorization.

21112112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517609 (or 517506 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21112112012 its reverse (21021121112), we get a palindrome (42133233124).

The spelling of 21112112012 in words is "twenty-one billion, one hundred twelve million, one hundred twelve thousand, twelve".