21104306 has 8 divisors (see below), whose sum is σ = 31703724. Its totient is φ = 10536400.

The previous prime is 21104287. The next prime is 21104311. The reversal of 21104306 is 60340112.

It can be written as a sum of positive squares in 2 ways, for example, as 16443025 + 4661281 = 4055^2 + 2159^2 .

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

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, 6125 + ... + 8928.

Almost surely, 2^21104306 is an apocalyptic number.

21104306 is a deficient number, since it is larger than the sum of its proper divisors (10599418).

21104306 is a wasteful number, since it uses less digits than its factorization.

21104306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15756.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21104306 is about 4593.9423157023. The cubic root of 21104306 is about 276.3484449477.

Adding to 21104306 its reverse (60340112), we get a palindrome (81444418).

The spelling of 21104306 in words is "twenty-one million, one hundred four thousand, three hundred six".