20021020010161 has 2 divisors, whose sum is σ = 20021020010162. Its totient is φ = 20021020010160.

The previous prime is 20021020010087. The next prime is 20021020010183. The reversal of 20021020010161 is 16101002012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19803345509025 + 217674501136 = 4450095^2 + 466556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021020010161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021020080161) 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, 10010510005080 + 10010510005081.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510005081).

Almost surely, 2^{20021020010161} is an apocalyptic number.

It is an amenable number.

20021020010161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021020010161 is an equidigital number, since it uses as much as digits as its factorization.

20021020010161 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 16.

Adding to 20021020010161 its reverse (16101002012002), we get a palindrome (36122022022163).

The spelling of 20021020010161 in words is "twenty trillion, twenty-one billion, twenty million, ten thousand, one hundred sixty-one".