241221221 has 2 divisors, whose sum is σ = 241221222. Its totient is φ = 241221220.

The previous prime is 241221203. The next prime is 241221223. The reversal of 241221221 is 122122142.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237930625 + 3290596 = 15425^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 241221221 - 2¹⁴ = 241204837 is a prime.

Together with 241221223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 241221221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (241221223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120610610 + 120610611.

It is an arithmetic number, because the mean of its divisors is an integer number (120610611).

Almost surely, 2^241221221 is an apocalyptic number.

It is an amenable number.

241221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

241221221 is an equidigital number, since it uses as much as digits as its factorization.

241221221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 17.

The square root of 241221221 is about 15531.2981105895. The cubic root of 241221221 is about 622.4987788345.

Adding to 241221221 its reverse (122122142), we get a palindrome (363343363).

The spelling of 241221221 in words is "two hundred forty-one million, two hundred twenty-one thousand, two hundred twenty-one".