11021 has 4 divisors (see below), whose sum is σ = 11232. Its totient is φ = 10812.

The previous prime is 11003. The next prime is 11027. The reversal of 11021 is 12011.

It is a happy number.

11021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11021 - 2⁶ = 10957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10996 and 11014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 156.

It is an arithmetic number, because the mean of its divisors is an integer number (2808).

2¹¹⁰²¹ is an apocalyptic number.

It is an amenable number.

11021 is a deficient number, since it is larger than the sum of its proper divisors (211).

11021 is a wasteful number, since it uses less digits than its factorization.

11021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 11021 is about 104.9809506530. The cubic root of 11021 is about 22.2539445096.

Adding to 11021 its reverse (12011), we get a palindrome (23032).

Subtracting 11021 from its reverse (12011), we obtain a triangular number (990 = T₄₄).

Multiplying 11021 by its reverse (12011), we get a palindrome (132373231).

It can be divided in two parts, 110 and 21, that added together give a palindrome (131).

The spelling of 11021 in words is "eleven thousand, twenty-one", and thus it is an iban number.