10809021 has 4 divisors (see below), whose sum is σ = 14412032. Its totient is φ = 7206012.

The previous prime is 10808999. The next prime is 10809023. The reversal of 10809021 is 12090801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 10809021 - 2⁷ = 10808893 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 (10809023) 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, 1801501 + ... + 1801506.

It is an arithmetic number, because the mean of its divisors is an integer number (3603008).

Almost surely, 2^10809021 is an apocalyptic number.

It is an amenable number.

10809021 is a deficient number, since it is larger than the sum of its proper divisors (3603011).

10809021 is an equidigital number, since it uses as much as digits as its factorization.

10809021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603010.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 10809021 is about 3287.7075599877. The cubic root of 10809021 is about 221.1034165839.

Adding to 10809021 its reverse (12090801), we get a palindrome (22899822).

It can be divided in two parts, 1080 and 9021, that added together give a palindrome (10101).

The spelling of 10809021 in words is "ten million, eight hundred nine thousand, twenty-one".