20000120102161 has 2 divisors, whose sum is σ = 20000120102162. Its totient is φ = 20000120102160.

The previous prime is 20000120102159. The next prime is 20000120102227. The reversal of 20000120102161 is 16120102100002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13813115560000 + 6187004542161 = 3716600^2 + 2487369^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000120102161 - 2¹ = 20000120102159 is a prime.

Together with 20000120102159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20000120102111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000060051080 + 10000060051081.

It is an arithmetic number, because the mean of its divisors is an integer number (10000060051081).

Almost surely, 2^{20000120102161} is an apocalyptic number.

It is an amenable number.

20000120102161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000120102161 is an equidigital number, since it uses as much as digits as its factorization.

20000120102161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20000120102161 its reverse (16120102100002), we get a palindrome (36120222202163).

The spelling of 20000120102161 in words is "twenty trillion, one hundred twenty million, one hundred two thousand, one hundred sixty-one".