21104347 has 8 divisors (see below), whose sum is σ = 23079600. Its totient is φ = 19138560.

The previous prime is 21104341. The next prime is 21104389. The reversal of 21104347 is 74340112.

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

It is a cyclic number.

It is not a de Polignac number, because 21104347 - 2³ = 21104339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21104341) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2803 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (2884950).

Almost surely, 2^21104347 is an apocalyptic number.

21104347 is a deficient number, since it is larger than the sum of its proper divisors (1975253).

21104347 is a wasteful number, since it uses less digits than its factorization.

21104347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21104347 is about 4593.9467780983. The cubic root of 21104347 is about 276.3486239045.

Adding to 21104347 its reverse (74340112), we get a palindrome (95444459).

The spelling of 21104347 in words is "twenty-one million, one hundred four thousand, three hundred forty-seven".