21302112112 has 20 divisors (see below), whose sum is σ = 41429781360. Its totient is φ = 10610555648.

The previous prime is 21302112109. The next prime is 21302112173. The reversal of 21302112112 is 21121120312.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2526937 + ... + 2535352.

It is an arithmetic number, because the mean of its divisors is an integer number (2071489068).

Almost surely, 2^21302112112 is an apocalyptic number.

It is an amenable number.

21302112112 is a deficient number, since it is larger than the sum of its proper divisors (20127669248).

21302112112 is a wasteful number, since it uses less digits than its factorization.

21302112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062560 (or 5062554 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21302112112 its reverse (21121120312), we get a palindrome (42423232424).

The spelling of 21302112112 in words is "twenty-one billion, three hundred two million, one hundred twelve thousand, one hundred twelve".