221434341221 has 2 divisors, whose sum is σ = 221434341222. Its totient is φ = 221434341220.

The previous prime is 221434341203. The next prime is 221434341229. The reversal of 221434341221 is 122143434122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130094390596 + 91339950625 = 360686^2 + 302225^2 .

It is a cyclic number.

It is not a de Polignac number, because 221434341221 - 2⁶ = 221434341157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221434341229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110717170610 + 110717170611.

It is an arithmetic number, because the mean of its divisors is an integer number (110717170611).

Almost surely, 2^221434341221 is an apocalyptic number.

It is an amenable number.

221434341221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221434341221 is an equidigital number, since it uses as much as digits as its factorization.

221434341221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 29.

Adding to 221434341221 its reverse (122143434122), we get a palindrome (343577775343).

The spelling of 221434341221 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred forty-one thousand, two hundred twenty-one".