11213021 has 12 divisors (see below), whose sum is σ = 12001500. Its totient is φ = 10473408.

The previous prime is 11212997. The next prime is 11213057. The reversal of 11213021 is 12031211.

It can be written as a sum of positive squares in 2 ways, for example, as 5112121 + 6100900 = 2261^2 + 2470^2 .

It is not a de Polignac number, because 11213021 - 2¹⁴ = 11196637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212993 and 11213011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213071) 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 11 ways as a sum of consecutive naturals, for example, 31955 + ... + 32303.

It is an arithmetic number, because the mean of its divisors is an integer number (1000125).

Almost surely, 2^11213021 is an apocalyptic number.

It is an amenable number.

11213021 is a deficient number, since it is larger than the sum of its proper divisors (788479).

11213021 is an equidigital number, since it uses as much as digits as its factorization.

11213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 11213021 is about 3348.5849250094. The cubic root of 11213021 is about 223.8244598891.

Adding to 11213021 its reverse (12031211), we get a palindrome (23244232).

The spelling of 11213021 in words is "eleven million, two hundred thirteen thousand, twenty-one".