11836021 has 4 divisors (see below), whose sum is σ = 11969100. Its totient is φ = 11702944.

The previous prime is 11836009. The next prime is 11836043. The reversal of 11836021 is 12063811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1240996 + 10595025 = 1114^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 11836021 - 2¹¹ = 11833973 is a prime.

It is a super-2 number, since 2×11836021² = 280182786224882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11835983 and 11836001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11836081) 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, 66406 + ... + 66583.

It is an arithmetic number, because the mean of its divisors is an integer number (2992275).

Almost surely, 2^11836021 is an apocalyptic number.

It is an amenable number.

11836021 is a deficient number, since it is larger than the sum of its proper divisors (133079).

11836021 is an equidigital number, since it uses as much as digits as its factorization.

11836021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133078.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 11836021 is about 3440.3518715387. The cubic root of 11836021 is about 227.8952337488.

Adding to 11836021 its reverse (12063811), we get a palindrome (23899832).

The spelling of 11836021 in words is "eleven million, eight hundred thirty-six thousand, twenty-one".