11684821 has 2 divisors, whose sum is σ = 11684822. Its totient is φ = 11684820.

The previous prime is 11684819. The next prime is 11684843. The reversal of 11684821 is 12848611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 192721 = 3390^2 + 439^2 .

It is a cyclic number.

It is not a de Polignac number, because 11684821 - 2¹ = 11684819 is a prime.

Together with 11684819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11684521) 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 as a sum of consecutive naturals, namely, 5842410 + 5842411.

It is an arithmetic number, because the mean of its divisors is an integer number (5842411).

Almost surely, 2^11684821 is an apocalyptic number.

It is an amenable number.

11684821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11684821 is an equidigital number, since it uses as much as digits as its factorization.

11684821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 31.

The square root of 11684821 is about 3418.3067445740. The cubic root of 11684821 is about 226.9206512370.

The spelling of 11684821 in words is "eleven million, six hundred eighty-four thousand, eight hundred twenty-one".