21110530 has 16 divisors (see below), whose sum is σ = 43427520. Its totient is φ = 7237872.

The previous prime is 21110513. The next prime is 21110543. The reversal of 21110530 is 3501112.

It is a self number, because there is not a number n which added to its sum of digits gives 21110530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150720 + ... + 150859.

It is an arithmetic number, because the mean of its divisors is an integer number (2714220).

Almost surely, 2^21110530 is an apocalyptic number.

21110530 is an abundant number, since it is smaller than the sum of its proper divisors (22316990).

21110530 is a wasteful number, since it uses less digits than its factorization.

21110530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301593.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 21110530 is about 4594.6196795818. The cubic root of 21110530 is about 276.3756088144.

Adding to 21110530 its reverse (3501112), we get a palindrome (24611642).

The spelling of 21110530 in words is "twenty-one million, one hundred ten thousand, five hundred thirty".