221543404241 has 2 divisors, whose sum is σ = 221543404242. Its totient is φ = 221543404240.

The previous prime is 221543404219. The next prime is 221543404259. The reversal of 221543404241 is 142404345122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221374014016 + 169390225 = 470504^2 + 13015^2 .

It is a cyclic number.

It is not a de Polignac number, because 221543404241 - 2⁶ = 221543404177 is a prime.

It is a super-2 number, since 2×221543404241² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221543404198 and 221543404207.

It is not a weakly prime, because it can be changed into another prime (221543403241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110771702120 + 110771702121.

It is an arithmetic number, because the mean of its divisors is an integer number (110771702121).

Almost surely, 2^221543404241 is an apocalyptic number.

It is an amenable number.

221543404241 is a deficient number, since it is larger than the sum of its proper divisors (1).

221543404241 is an equidigital number, since it uses as much as digits as its factorization.

221543404241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 221543404241 its reverse (142404345122), we get a palindrome (363947749363).

The spelling of 221543404241 in words is "two hundred twenty-one billion, five hundred forty-three million, four hundred four thousand, two hundred forty-one".