21604112 has 10 divisors (see below), whose sum is σ = 41857998. Its totient is φ = 10802048.

The previous prime is 21604109. The next prime is 21604139. The reversal of 21604112 is 21140612.

It can be written as a sum of positive squares in only one way, i.e., 17007376 + 4596736 = 4124^2 + 2144^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675113 + ... + 675144.

Almost surely, 2^21604112 is an apocalyptic number.

It is an amenable number.

21604112 is a deficient number, since it is larger than the sum of its proper divisors (20253886).

21604112 is a wasteful number, since it uses less digits than its factorization.

21604112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350265 (or 1350259 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21604112 is about 4648.0223751613. The cubic root of 21604112 is about 278.5130013152.

Adding to 21604112 its reverse (21140612), we get a palindrome (42744724).

The spelling of 21604112 in words is "twenty-one million, six hundred four thousand, one hundred twelve".