21113265 has 8 divisors (see below), whose sum is σ = 33781248. Its totient is φ = 11260400.

The previous prime is 21113251. The next prime is 21113297. The reversal of 21113265 is 56231112.

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

It is not a de Polignac number, because 21113265 - 2⁹ = 21112753 is a prime.

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, 703761 + ... + 703790.

It is an arithmetic number, because the mean of its divisors is an integer number (4222656).

Almost surely, 2^21113265 is an apocalyptic number.

It is an amenable number.

21113265 is a deficient number, since it is larger than the sum of its proper divisors (12667983).

21113265 is a wasteful number, since it uses less digits than its factorization.

21113265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407559.

The product of its digits is 360, while the sum is 21.

The square root of 21113265 is about 4594.9173006704. The cubic root of 21113265 is about 276.3875436900.

Adding to 21113265 its reverse (56231112), we get a palindrome (77344377).

The spelling of 21113265 in words is "twenty-one million, one hundred thirteen thousand, two hundred sixty-five".