21104112 has 40 divisors (see below), whose sum is σ = 56402640. Its totient is φ = 6791680.

The previous prime is 21104071. The next prime is 21104131. The reversal of 21104112 is 21140112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6189 + ... + 8972.

It is an arithmetic number, because the mean of its divisors is an integer number (1410066).

Almost surely, 2^21104112 is an apocalyptic number.

It is an amenable number.

21104112 is an abundant number, since it is smaller than the sum of its proper divisors (35298528).

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

21104112 is a wasteful number, since it uses less digits than its factorization.

21104112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15201 (or 15195 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21104112 is about 4593.9212008915. The cubic root of 21104112 is about 276.3475981732.

Adding to 21104112 its reverse (21140112), we get a palindrome (42244224).

The spelling of 21104112 in words is "twenty-one million, one hundred four thousand, one hundred twelve".