11686021 has 4 divisors (see below), whose sum is σ = 12373452. Its totient is φ = 10998592.

The previous prime is 11686019. The next prime is 11686027. The reversal of 11686021 is 12068611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12068611 = 29 ⋅416159.

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 3101121 = 2930^2 + 1761^2 .

It is not a de Polignac number, because 11686021 - 2¹ = 11686019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11686027) 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, 343690 + ... + 343723.

It is an arithmetic number, because the mean of its divisors is an integer number (3093363).

Almost surely, 2^11686021 is an apocalyptic number.

It is an amenable number.

11686021 is a deficient number, since it is larger than the sum of its proper divisors (687431).

11686021 is an equidigital number, since it uses as much as digits as its factorization.

11686021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687430.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 11686021 is about 3418.4822655676. The cubic root of 11686021 is about 226.9284190199.

The spelling of 11686021 in words is "eleven million, six hundred eighty-six thousand, twenty-one".