21112102012 has 6 divisors (see below), whose sum is σ = 36946178528. Its totient is φ = 10556051004.

The previous prime is 21112102007. The next prime is 21112102027. The reversal of 21112102012 is 21020121112.

It is a junction number, because it is equal to n+sod(n) for n = 21112101983 and 21112102001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639012748 + ... + 2639012755.

Almost surely, 2^21112102012 is an apocalyptic number.

It is an amenable number.

21112102012 is a deficient number, since it is larger than the sum of its proper divisors (15834076516).

21112102012 is a wasteful number, since it uses less digits than its factorization.

21112102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278025507 (or 5278025505 counting only the distinct ones).

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

Adding to 21112102012 its reverse (21020121112), we get a palindrome (42132223124).

The spelling of 21112102012 in words is "twenty-one billion, one hundred twelve million, one hundred two thousand, twelve".