11008021 has 4 divisors (see below), whose sum is σ = 11014732. Its totient is φ = 11001312.

The previous prime is 11008013. The next prime is 11008031. The reversal of 11008021 is 12080011.

It is the 1355-th star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12080011 = 71 ⋅170141.

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 1311025 = 3114^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 11008021 - 2³ = 11008013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11007992 and 11008010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11008001) 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, 931 + ... + 4783.

It is an arithmetic number, because the mean of its divisors is an integer number (2753683).

Almost surely, 2^11008021 is an apocalyptic number.

It is an amenable number.

11008021 is a deficient number, since it is larger than the sum of its proper divisors (6711).

11008021 is an equidigital number, since it uses as much as digits as its factorization.

11008021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6710.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 11008021 is about 3317.8337812494. The cubic root of 11008021 is about 222.4520521182.

Adding to 11008021 its reverse (12080011), we get a palindrome (23088032).

The spelling of 11008021 in words is "eleven million, eight thousand, twenty-one".