11240021 has 6 divisors (see below), whose sum is σ = 12171330. Its totient is φ = 10375248.

The previous prime is 11240017. The next prime is 11240051. The reversal of 11240021 is 12004211.

It can be written as a sum of positive squares in 3 ways, for example, as 442225 + 10797796 = 665^2 + 3286^2 .

It is not a de Polignac number, because 11240021 - 2² = 11240017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11239984 and 11240011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11240051) 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 5 ways as a sum of consecutive naturals, for example, 33086 + ... + 33423.

It is an arithmetic number, because the mean of its divisors is an integer number (2028555).

Almost surely, 2^11240021 is an apocalyptic number.

It is an amenable number.

11240021 is a deficient number, since it is larger than the sum of its proper divisors (931309).

11240021 is an equidigital number, since it uses as much as digits as its factorization.

11240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66535 (or 66522 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 11240021 is about 3352.6140547340. The cubic root of 11240021 is about 224.0039659693.

Adding to 11240021 its reverse (12004211), we get a palindrome (23244232).

The spelling of 11240021 in words is "eleven million, two hundred forty thousand, twenty-one".