21112204 has 6 divisors (see below), whose sum is σ = 36946364. Its totient is φ = 10556100.

The previous prime is 21112199. The next prime is 21112207. The reversal of 21112204 is 40221112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21112207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639022 + ... + 2639029.

Almost surely, 2^21112204 is an apocalyptic number.

It is an amenable number.

21112204 is a deficient number, since it is larger than the sum of its proper divisors (15834160).

21112204 is a wasteful number, since it uses less digits than its factorization.

21112204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278055 (or 5278053 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21112204 is about 4594.8018455642. The cubic root of 21112204 is about 276.3829138661.

Adding to 21112204 its reverse (40221112), we get a palindrome (61333316).

It can be divided in two parts, 21112 and 204, that added together give a square (21316 = 146²).

The spelling of 21112204 in words is "twenty-one million, one hundred twelve thousand, two hundred four".