10565821 has 12 divisors (see below), whose sum is σ = 12344832. Its totient is φ = 9016728.

The previous prime is 10565791. The next prime is 10565827. The reversal of 10565821 is 12856501.

10565821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10565821 - 2⁷ = 10565693 is a prime.

It is a super-2 number, since 2×10565821² = 223273146808082, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 10565821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10565827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18486 + ... + 19048.

It is an arithmetic number, because the mean of its divisors is an integer number (1028736).

Almost surely, 2^10565821 is an apocalyptic number.

It is an amenable number.

10565821 is a deficient number, since it is larger than the sum of its proper divisors (1779011).

10565821 is an equidigital number, since it uses as much as digits as its factorization.

10565821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 10565821 is about 3250.5108829229. The cubic root of 10565821 is about 219.4325666356.

The spelling of 10565821 in words is "ten million, five hundred sixty-five thousand, eight hundred twenty-one".