100221012161 has 2 divisors, whose sum is σ = 100221012162. Its totient is φ = 100221012160.

The previous prime is 100221012127. The next prime is 100221012179. The reversal of 100221012161 is 161210122001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81250081936 + 18970930225 = 285044^2 + 137735^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221012161 - 2³⁰ = 99147270337 is a prime.

It is not a weakly prime, because it can be changed into another prime (100221012461) 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, 50110506080 + 50110506081.

It is an arithmetic number, because the mean of its divisors is an integer number (50110506081).

Almost surely, 2^100221012161 is an apocalyptic number.

It is an amenable number.

100221012161 is a deficient number, since it is larger than the sum of its proper divisors (1).

100221012161 is an equidigital number, since it uses as much as digits as its factorization.

100221012161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 100221012161 its reverse (161210122001), we get a palindrome (261431134162).

The spelling of 100221012161 in words is "one hundred billion, two hundred twenty-one million, twelve thousand, one hundred sixty-one".