11530021 has 4 divisors (see below), whose sum is σ = 11548332. Its totient is φ = 11511712.

The previous prime is 11530019. The next prime is 11530027. The reversal of 11530021 is 12003511.

11530021 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 12003511 = 13 ⋅923347.

It can be written as a sum of positive squares in 2 ways, for example, as 1988100 + 9541921 = 1410^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 11530021 - 2¹ = 11530019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11529983 and 11530010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11530027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8176 + ... + 9481.

It is an arithmetic number, because the mean of its divisors is an integer number (2887083).

Almost surely, 2^11530021 is an apocalyptic number.

It is an amenable number.

11530021 is a deficient number, since it is larger than the sum of its proper divisors (18311).

11530021 is an equidigital number, since it uses as much as digits as its factorization.

11530021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18310.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 11530021 is about 3395.5884615189. The cubic root of 11530021 is about 225.9141149107.

Adding to 11530021 its reverse (12003511), we get a palindrome (23533532).

The spelling of 11530021 in words is "eleven million, five hundred thirty thousand, twenty-one".