11816221 has 2 divisors, whose sum is σ = 11816222. Its totient is φ = 11816220.

The previous prime is 11816213. The next prime is 11816237. The reversal of 11816221 is 12261811.

11816221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 2604996 = 3035^2 + 1614^2 .

It is a cyclic number.

It is not a de Polignac number, because 11816221 - 2³ = 11816213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11816192 and 11816201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11816201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5908110 + 5908111.

It is an arithmetic number, because the mean of its divisors is an integer number (5908111).

Almost surely, 2^11816221 is an apocalyptic number.

It is an amenable number.

11816221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11816221 is an equidigital number, since it uses as much as digits as its factorization.

11816221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 22.

The square root of 11816221 is about 3437.4730544398. The cubic root of 11816221 is about 227.7680839200.

The spelling of 11816221 in words is "eleven million, eight hundred sixteen thousand, two hundred twenty-one".