21116265 has 8 divisors (see below), whose sum is σ = 33786048. Its totient is φ = 11262000.

The previous prime is 21116257. The next prime is 21116267. The reversal of 21116265 is 56261112.

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

It is not a de Polignac number, because 21116265 - 2³ = 21116257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21116267) 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, 703861 + ... + 703890.

It is an arithmetic number, because the mean of its divisors is an integer number (4223256).

Almost surely, 2^21116265 is an apocalyptic number.

It is an amenable number.

21116265 is a deficient number, since it is larger than the sum of its proper divisors (12669783).

21116265 is a wasteful number, since it uses less digits than its factorization.

21116265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407759.

The product of its digits is 720, while the sum is 24.

The square root of 21116265 is about 4595.2437367348. The cubic root of 21116265 is about 276.4006337759.

Adding to 21116265 its reverse (56261112), we get a palindrome (77377377).

The spelling of 21116265 in words is "twenty-one million, one hundred sixteen thousand, two hundred sixty-five".