1021100161 has 2 divisors, whose sum is σ = 1021100162. Its totient is φ = 1021100160.

The previous prime is 1021100153. The next prime is 1021100177. The reversal of 1021100161 is 1610011201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673091136 + 348009025 = 25944^2 + 18655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021100161 - 2³ = 1021100153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021100141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510550080 + 510550081.

It is an arithmetic number, because the mean of its divisors is an integer number (510550081).

Almost surely, 2^1021100161 is an apocalyptic number.

It is an amenable number.

1021100161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021100161 is an equidigital number, since it uses as much as digits as its factorization.

1021100161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1021100161 is about 31954.6578920820. The cubic root of 1021100161 is about 1006.9844903199.

Adding to 1021100161 its reverse (1610011201), we get a palindrome (2631111362).

The spelling of 1021100161 in words is "one billion, twenty-one million, one hundred thousand, one hundred sixty-one".