10821563 has 4 divisors (see below), whose sum is σ = 10839720. Its totient is φ = 10803408.

The previous prime is 10821541. The next prime is 10821589. The reversal of 10821563 is 36512801.

10821563 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36512801 = 13 ⋅2808677.

It is a cyclic number.

It is not a de Polignac number, because 10821563 - 2¹⁶ = 10756027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10821463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8153 + ... + 9386.

It is an arithmetic number, because the mean of its divisors is an integer number (2709930).

Almost surely, 2^10821563 is an apocalyptic number.

10821563 is a deficient number, since it is larger than the sum of its proper divisors (18157).

10821563 is an equidigital number, since it uses as much as digits as its factorization.

10821563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18156.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 10821563 is about 3289.6144150949. The cubic root of 10821563 is about 221.1889009579.

The spelling of 10821563 in words is "ten million, eight hundred twenty-one thousand, five hundred sixty-three".