21104607 has 8 divisors (see below), whose sum is σ = 28183984. Its totient is φ = 14047488.

The previous prime is 21104591. The next prime is 21104641. The reversal of 21104607 is 70640112.

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

It is not a de Polignac number, because 21104607 - 2⁴ = 21104591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3208 + ... + 7245.

It is an arithmetic number, because the mean of its divisors is an integer number (3522998).

Almost surely, 2^21104607 is an apocalyptic number.

21104607 is a deficient number, since it is larger than the sum of its proper divisors (7079377).

21104607 is a wasteful number, since it uses less digits than its factorization.

21104607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11129.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21104607 is about 4593.9750761187. The cubic root of 21104607 is about 276.3497587473.

Adding to 21104607 its reverse (70640112), we get a palindrome (91744719).

The spelling of 21104607 in words is "twenty-one million, one hundred four thousand, six hundred seven".