21012112112 has 20 divisors (see below), whose sum is σ = 40735587696. Its totient is φ = 10499702400.

The previous prime is 21012112109. The next prime is 21012112123. The reversal of 21012112112 is 21121121012.

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 in 3 ways as a sum of consecutive naturals, for example, 369764 + ... + 422787.

Almost surely, 2^21012112112 is an apocalyptic number.

It is an amenable number.

21012112112 is a deficient number, since it is larger than the sum of its proper divisors (19723475584).

21012112112 is a wasteful number, since it uses less digits than its factorization.

21012112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794216 (or 794210 counting only the distinct ones).

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

Adding to 21012112112 its reverse (21121121012), we get a palindrome (42133233124).

The spelling of 21012112112 in words is "twenty-one billion, twelve million, one hundred twelve thousand, one hundred twelve".