21102312112 has 40 divisors (see below), whose sum is σ = 47083272192. Its totient is φ = 8974804800.

The previous prime is 21102312103. The next prime is 21102312139. The reversal of 21102312112 is 21121320112.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704464 + ... + 733807.

Almost surely, 2^21102312112 is an apocalyptic number.

It is an amenable number.

21102312112 is an abundant number, since it is smaller than the sum of its proper divisors (25980960080).

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

21102312112 is a wasteful number, since it uses less digits than its factorization.

21102312112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438417 (or 1438411 counting only the distinct ones).

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

Adding to 21102312112 its reverse (21121320112), we get a palindrome (42223632224).

The spelling of 21102312112 in words is "twenty-one billion, one hundred two million, three hundred twelve thousand, one hundred twelve".