20210021000161 has 2 divisors, whose sum is σ = 20210021000162. Its totient is φ = 20210021000160.

The previous prime is 20210021000159. The next prime is 20210021000209. The reversal of 20210021000161 is 16100012001202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18332792185761 + 1877228814400 = 4281681^2 + 1370120^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210021000161 - 2¹ = 20210021000159 is a prime.

Together with 20210021000159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20210021000101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105010500080 + 10105010500081.

It is an arithmetic number, because the mean of its divisors is an integer number (10105010500081).

Almost surely, 2^{20210021000161} is an apocalyptic number.

It is an amenable number.

20210021000161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210021000161 is an equidigital number, since it uses as much as digits as its factorization.

20210021000161 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 20210021000161 its reverse (16100012001202), we get a palindrome (36310033001363).

The spelling of 20210021000161 in words is "twenty trillion, two hundred ten billion, twenty-one million, one hundred sixty-one", and thus it is an aban number.