20202120161 has 2 divisors, whose sum is σ = 20202120162. Its totient is φ = 20202120160.

The previous prime is 20202120149. The next prime is 20202120163. The reversal of 20202120161 is 16102120202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14438425600 + 5763694561 = 120160^2 + 75919^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202120161 - 2²² = 20197925857 is a prime.

Together with 20202120163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20202120163) 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, 10101060080 + 10101060081.

It is an arithmetic number, because the mean of its divisors is an integer number (10101060081).

Almost surely, 2^20202120161 is an apocalyptic number.

It is an amenable number.

20202120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202120161 is an equidigital number, since it uses as much as digits as its factorization.

20202120161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20202120161 its reverse (16102120202), we get a palindrome (36304240363).

The spelling of 20202120161 in words is "twenty billion, two hundred two million, one hundred twenty thousand, one hundred sixty-one".