21104366 has 8 divisors (see below), whose sum is σ = 32677824. Its totient is φ = 10211760.

The previous prime is 21104341. The next prime is 21104389. The reversal of 21104366 is 66340112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170135 + ... + 170258.

It is an arithmetic number, because the mean of its divisors is an integer number (4084728).

Almost surely, 2^21104366 is an apocalyptic number.

21104366 is a deficient number, since it is larger than the sum of its proper divisors (11573458).

21104366 is a wasteful number, since it uses less digits than its factorization.

21104366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340426.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21104366 is about 4593.9488460365. The cubic root of 21104366 is about 276.3487068356.

Adding to 21104366 its reverse (66340112), we get a palindrome (87444478).

The spelling of 21104366 in words is "twenty-one million, one hundred four thousand, three hundred sixty-six".