221220200161 has 2 divisors, whose sum is σ = 221220200162. Its totient is φ = 221220200160.

The previous prime is 221220200153. The next prime is 221220200171. The reversal of 221220200161 is 161002022122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219885028561 + 1335171600 = 468919^2 + 36540^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220200161 - 2³ = 221220200153 is a prime.

It is not a weakly prime, because it can be changed into another prime (221220200171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610100080 + 110610100081.

It is an arithmetic number, because the mean of its divisors is an integer number (110610100081).

Almost surely, 2^221220200161 is an apocalyptic number.

It is an amenable number.

221220200161 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220200161 is an equidigital number, since it uses as much as digits as its factorization.

221220200161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221220200161 its reverse (161002022122), we get a palindrome (382222222283).

The spelling of 221220200161 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred thousand, one hundred sixty-one".