11922221 has 2 divisors, whose sum is σ = 11922222. Its totient is φ = 11922220.

The previous prime is 11922193. The next prime is 11922227. The reversal of 11922221 is 12222911.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9066121 + 2856100 = 3011^2 + 1690^2 .

It is an emirp because it is prime and its reverse (12222911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11922221 - 2¹⁰ = 11921197 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11922193 and 11922202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11922227) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5961110 + 5961111.

It is an arithmetic number, because the mean of its divisors is an integer number (5961111).

Almost surely, 2^11922221 is an apocalyptic number.

It is an amenable number.

11922221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11922221 is an equidigital number, since it uses as much as digits as its factorization.

11922221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 11922221 is about 3452.8569330339. The cubic root of 11922221 is about 228.4471385842.

The spelling of 11922221 in words is "eleven million, nine hundred twenty-two thousand, two hundred twenty-one".