21112032112 has 20 divisors (see below), whose sum is σ = 41279836840. Its totient is φ = 10459171008.

The previous prime is 21112032089. The next prime is 21112032173. The reversal of 21112032112 is 21123021112.

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, 6051018 + ... + 6054505.

It is an arithmetic number, because the mean of its divisors is an integer number (2063991842).

Almost surely, 2^21112032112 is an apocalyptic number.

It is an amenable number.

21112032112 is a deficient number, since it is larger than the sum of its proper divisors (20167804728).

21112032112 is a wasteful number, since it uses less digits than its factorization.

21112032112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12105640 (or 12105634 counting only the distinct ones).

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

Adding to 21112032112 its reverse (21123021112), we get a palindrome (42235053224).

The spelling of 21112032112 in words is "twenty-one billion, one hundred twelve million, thirty-two thousand, one hundred twelve".