11840221 has 2 divisors, whose sum is σ = 11840222. Its totient is φ = 11840220.

The previous prime is 11840219. The next prime is 11840243. The reversal of 11840221 is 12204811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7371225 + 4468996 = 2715^2 + 2114^2 .

It is an emirp because it is prime and its reverse (12204811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11840221 - 2¹ = 11840219 is a prime.

Together with 11840219, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11840251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5920110 + 5920111.

It is an arithmetic number, because the mean of its divisors is an integer number (5920111).

Almost surely, 2^11840221 is an apocalyptic number.

It is an amenable number.

11840221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11840221 is an equidigital number, since it uses as much as digits as its factorization.

11840221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 11840221 is about 3440.9622200774. The cubic root of 11840221 is about 227.9221866915.

The spelling of 11840221 in words is "eleven million, eight hundred forty thousand, two hundred twenty-one".