11669221 has 2 divisors, whose sum is σ = 11669222. Its totient is φ = 11669220.

The previous prime is 11669209. The next prime is 11669227. The reversal of 11669221 is 12296611.

11669221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6890625 + 4778596 = 2625^2 + 2186^2 .

It is an emirp because it is prime and its reverse (12296611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11669221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11669221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11669227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5834610 + 5834611.

It is an arithmetic number, because the mean of its divisors is an integer number (5834611).

Almost surely, 2^11669221 is an apocalyptic number.

It is an amenable number.

11669221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11669221 is an equidigital number, since it uses as much as digits as its factorization.

11669221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 11669221 is about 3416.0241509685. The cubic root of 11669221 is about 226.8196216280.

The spelling of 11669221 in words is "eleven million, six hundred sixty-nine thousand, two hundred twenty-one".