221544369097 has 2 divisors, whose sum is σ = 221544369098. Its totient is φ = 221544369096.

The previous prime is 221544369091. The next prime is 221544369119. The reversal of 221544369097 is 790963445122.

221544369097 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., 196039959696 + 25504409401 = 442764^2 + 159701^2 .

It is a cyclic number.

It is not a de Polignac number, because 221544369097 - 2¹¹ = 221544367049 is a prime.

It is not a weakly prime, because it can be changed into another prime (221544369091) 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, 110772184548 + 110772184549.

It is an arithmetic number, because the mean of its divisors is an integer number (110772184549).

Almost surely, 2^221544369097 is an apocalyptic number.

It is an amenable number.

221544369097 is a deficient number, since it is larger than the sum of its proper divisors (1).

221544369097 is an equidigital number, since it uses as much as digits as its factorization.

221544369097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 221544369097 in words is "two hundred twenty-one billion, five hundred forty-four million, three hundred sixty-nine thousand, ninety-seven".