11439221 has 2 divisors, whose sum is σ = 11439222. Its totient is φ = 11439220.

The previous prime is 11439209. The next prime is 11439227. The reversal of 11439221 is 12293411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6195121 + 5244100 = 2489^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 11439221 - 2⁶ = 11439157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11439227) 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, 5719610 + 5719611.

It is an arithmetic number, because the mean of its divisors is an integer number (5719611).

Almost surely, 2^11439221 is an apocalyptic number.

It is an amenable number.

11439221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11439221 is an equidigital number, since it uses as much as digits as its factorization.

11439221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 11439221 is about 3382.1917450080. The cubic root of 11439221 is about 225.3195197018.

The spelling of 11439221 in words is "eleven million, four hundred thirty-nine thousand, two hundred twenty-one".