10821665 has 8 divisors (see below), whose sum is σ = 13022208. Its totient is φ = 8633200.

The previous prime is 10821647. The next prime is 10821677. The reversal of 10821665 is 56612801.

It is a happy number.

10821665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 10821665 - 2⁸ = 10821409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 911 + ... + 4740.

It is an arithmetic number, because the mean of its divisors is an integer number (1627776).

Almost surely, 2^10821665 is an apocalyptic number.

It is an amenable number.

10821665 is a deficient number, since it is larger than the sum of its proper divisors (2200543).

10821665 is an equidigital number, since it uses as much as digits as its factorization.

10821665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 10821665 is about 3289.6299183951. The cubic root of 10821665 is about 221.1895959036.

The spelling of 10821665 in words is "ten million, eight hundred twenty-one thousand, six hundred sixty-five".