10821169 has 4 divisors (see below), whose sum is σ = 11025396. Its totient is φ = 10616944.

The previous prime is 10821143. The next prime is 10821179. The reversal of 10821169 is 96112801.

It is a happy number.

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 2624400 + 8196769 = 1620^2 + 2863^2 .

It is a cyclic number.

It is not a de Polignac number, because 10821169 - 2⁵ = 10821137 is a prime.

It is a super-2 number, since 2×10821169² = 234195397053122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10821179) 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 3 ways as a sum of consecutive naturals, for example, 102034 + ... + 102139.

It is an arithmetic number, because the mean of its divisors is an integer number (2756349).

Almost surely, 2^10821169 is an apocalyptic number.

It is an amenable number.

10821169 is a deficient number, since it is larger than the sum of its proper divisors (204227).

10821169 is an equidigital number, since it uses as much as digits as its factorization.

10821169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204226.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 10821169 is about 3289.5545291118. The cubic root of 10821169 is about 221.1862165187.

The spelling of 10821169 in words is "ten million, eight hundred twenty-one thousand, one hundred sixty-nine".