10440821 has 4 divisors (see below), whose sum is σ = 10612044. Its totient is φ = 10269600.

The previous prime is 10440809. The next prime is 10440851. The reversal of 10440821 is 12804401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 448900 + 9991921 = 670^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 10440821 - 2¹⁴ = 10424437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10440793 and 10440802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10440851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85520 + ... + 85641.

It is an arithmetic number, because the mean of its divisors is an integer number (2653011).

Almost surely, 2^10440821 is an apocalyptic number.

It is an amenable number.

10440821 is a deficient number, since it is larger than the sum of its proper divisors (171223).

10440821 is an equidigital number, since it uses as much as digits as its factorization.

10440821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171222.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 10440821 is about 3231.2259283436. The cubic root of 10440821 is about 218.5637919051.

The spelling of 10440821 in words is "ten million, four hundred forty thousand, eight hundred twenty-one".