221010161 has 2 divisors, whose sum is σ = 221010162. Its totient is φ = 221010160.

The previous prime is 221010143. The next prime is 221010169. The reversal of 221010161 is 161010122.

221010161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172791025 + 48219136 = 13145^2 + 6944^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010161 - 2²² = 216815857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221010169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505080 + 110505081.

It is an arithmetic number, because the mean of its divisors is an integer number (110505081).

Almost surely, 2^221010161 is an apocalyptic number.

It is an amenable number.

221010161 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010161 is an equidigital number, since it uses as much as digits as its factorization.

221010161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 221010161 is about 14866.4104948034. The cubic root of 221010161 is about 604.6036253466.

Adding to 221010161 its reverse (161010122), we get a palindrome (382020283).

The spelling of 221010161 in words is "two hundred twenty-one million, ten thousand, one hundred sixty-one".