21210112112 has 20 divisors (see below), whose sum is σ = 46965248496. Its totient is φ = 9090048000.

The previous prime is 21210112111. The next prime is 21210112123. The reversal of 21210112112 is 21121101212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210112111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94687889 + ... + 94688112.

Almost surely, 2^21210112112 is an apocalyptic number.

It is an amenable number.

21210112112 is an abundant number, since it is smaller than the sum of its proper divisors (25755136384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210112112 is a wasteful number, since it uses less digits than its factorization.

21210112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189376016 (or 189376010 counting only the distinct ones).

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

Adding to 21210112112 its reverse (21121101212), we get a palindrome (42331213324).

The spelling of 21210112112 in words is "twenty-one billion, two hundred ten million, one hundred twelve thousand, one hundred twelve".