21103585 has 16 divisors (see below), whose sum is σ = 26818560. Its totient is φ = 15897600.

The previous prime is 21103559. The next prime is 21103603. The reversal of 21103585 is 58530112.

It is a happy number.

It is not a de Polignac number, because 21103585 - 2⁵ = 21103553 is a prime.

It is a super-2 number, since 2×21103585² = 890722599704450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17760 + ... + 18910.

It is an arithmetic number, because the mean of its divisors is an integer number (1676160).

Almost surely, 2^21103585 is an apocalyptic number.

It is an amenable number.

21103585 is a deficient number, since it is larger than the sum of its proper divisors (5714975).

21103585 is a wasteful number, since it uses less digits than its factorization.

21103585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 21103585 is about 4593.8638421268. The cubic root of 21103585 is about 276.3452978885.

Adding to 21103585 its reverse (58530112), we get a palindrome (79633697).

The spelling of 21103585 in words is "twenty-one million, one hundred three thousand, five hundred eighty-five".