221535442417 has 2 divisors, whose sum is σ = 221535442418. Its totient is φ = 221535442416.

The previous prime is 221535442409. The next prime is 221535442483. The reversal of 221535442417 is 714244535122.

221535442417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210163566096 + 11371876321 = 458436^2 + 106639^2 .

It is a cyclic number.

It is not a de Polignac number, because 221535442417 - 2³ = 221535442409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221535442417.

It is not a weakly prime, because it can be changed into another prime (221535442487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110767721208 + 110767721209.

It is an arithmetic number, because the mean of its divisors is an integer number (110767721209).

Almost surely, 2^221535442417 is an apocalyptic number.

It is an amenable number.

221535442417 is a deficient number, since it is larger than the sum of its proper divisors (1).

221535442417 is an equidigital number, since it uses as much as digits as its factorization.

221535442417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 40.

Adding to 221535442417 its reverse (714244535122), we get a palindrome (935779977539).

The spelling of 221535442417 in words is "two hundred twenty-one billion, five hundred thirty-five million, four hundred forty-two thousand, four hundred seventeen".