21112012 has 12 divisors (see below), whose sum is σ = 37017400. Its totient is φ = 10535616.

The previous prime is 21112009. The next prime is 21112019. The reversal of 21112012 is 21021112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112012.

It is not an unprimeable number, because it can be changed into a prime (21112019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2637 + ... + 7012.

Almost surely, 2^21112012 is an apocalyptic number.

It is an amenable number.

21112012 is a deficient number, since it is larger than the sum of its proper divisors (15905388).

21112012 is a wasteful number, since it uses less digits than its factorization.

21112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200 (or 10198 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21112012 is about 4594.7809523415. The cubic root of 21112012 is about 276.3820760303.

Adding to 21112012 its reverse (21021112), we get a palindrome (42133124).

The spelling of 21112012 in words is "twenty-one million, one hundred twelve thousand, twelve".