21330265 has 16 divisors (see below), whose sum is σ = 28013760. Its totient is φ = 15462720.

The previous prime is 21330259. The next prime is 21330271. The reversal of 21330265 is 56203312.

It is an interprime number because it is at equal distance from previous prime (21330259) and next prime (21330271).

It is not a de Polignac number, because 21330265 - 2¹³ = 21322073 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 29731 + ... + 30439.

It is an arithmetic number, because the mean of its divisors is an integer number (1750860).

Almost surely, 2^21330265 is an apocalyptic number.

It is an amenable number.

21330265 is a deficient number, since it is larger than the sum of its proper divisors (6683495).

21330265 is a wasteful number, since it uses less digits than its factorization.

21330265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21330265 is about 4618.4699847460. The cubic root of 21330265 is about 277.3312124558.

Adding to 21330265 its reverse (56203312), we get a palindrome (77533577).

The spelling of 21330265 in words is "twenty-one million, three hundred thirty thousand, two hundred sixty-five".