10839821 has 4 divisors (see below), whose sum is σ = 10847100. Its totient is φ = 10832544.

The previous prime is 10839817. The next prime is 10839839. The reversal of 10839821 is 12893801.

10839821 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.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 1755625 = 3014^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 10839821 - 2² = 10839817 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 (10839811) 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, 506 + ... + 4683.

It is an arithmetic number, because the mean of its divisors is an integer number (2711775).

Almost surely, 2^10839821 is an apocalyptic number.

It is an amenable number.

10839821 is a deficient number, since it is larger than the sum of its proper divisors (7279).

10839821 is an equidigital number, since it uses as much as digits as its factorization.

10839821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 10839821 is about 3292.3883428296. The cubic root of 10839821 is about 221.3132267404.

The spelling of 10839821 in words is "ten million, eight hundred thirty-nine thousand, eight hundred twenty-one".