10821009 has 8 divisors (see below), whose sum is σ = 14625952. Its totient is φ = 7115040.

The previous prime is 10821001. The next prime is 10821037. The reversal of 10821009 is 90012801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10821009 - 2³ = 10821001 is a prime.

It is a super-3 number, since 3×10821009³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10821001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24487 + ... + 24924.

It is an arithmetic number, because the mean of its divisors is an integer number (1828244).

Almost surely, 2^10821009 is an apocalyptic number.

It is an amenable number.

10821009 is a deficient number, since it is larger than the sum of its proper divisors (3804943).

10821009 is an equidigital number, since it uses as much as digits as its factorization.

10821009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49487.

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

The square root of 10821009 is about 3289.5302096196. The cubic root of 10821009 is about 221.1851263724.

The spelling of 10821009 in words is "ten million, eight hundred twenty-one thousand, nine".