11636021 has 4 divisors (see below), whose sum is σ = 11644044. Its totient is φ = 11628000.

The previous prime is 11635997. The next prime is 11636029. The reversal of 11636021 is 12063611.

11636021 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1144900 + 10491121 = 1070^2 + 3239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11636021 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 = 11635984 and 11636002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11636029) 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, 1160 + ... + 4961.

It is an arithmetic number, because the mean of its divisors is an integer number (2911011).

Almost surely, 2^11636021 is an apocalyptic number.

It is an amenable number.

11636021 is a deficient number, since it is larger than the sum of its proper divisors (8023).

11636021 is an equidigital number, since it uses as much as digits as its factorization.

11636021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 11636021 is about 3411.1612392263. The cubic root of 11636021 is about 226.6043097885.

Adding to 11636021 its reverse (12063611), we get a palindrome (23699632).

The spelling of 11636021 in words is "eleven million, six hundred thirty-six thousand, twenty-one".