10889821 has 4 divisors (see below), whose sum is σ = 10896444. Its totient is φ = 10883200.

The previous prime is 10889779. The next prime is 10889891. The reversal of 10889821 is 12898801.

10889821 is digitally balanced in base 2, 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12898801 = 17 ⋅758753.

It can be written as a sum of positive squares in 2 ways, for example, as 10272025 + 617796 = 3205^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 10889821 - 2⁷ = 10889693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10889891) 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, 1251 + ... + 4831.

It is an arithmetic number, because the mean of its divisors is an integer number (2724111).

Almost surely, 2^10889821 is an apocalyptic number.

It is an amenable number.

10889821 is a deficient number, since it is larger than the sum of its proper divisors (6623).

10889821 is an equidigital number, since it uses as much as digits as its factorization.

10889821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 10889821 is about 3299.9728786764. The cubic root of 10889821 is about 221.6529829934.

The spelling of 10889821 in words is "ten million, eight hundred eighty-nine thousand, eight hundred twenty-one".