20202111120161 has 2 divisors, whose sum is σ = 20202111120162. Its totient is φ = 20202111120160.

The previous prime is 20202111120157. The next prime is 20202111120173. The reversal of 20202111120161 is 16102111120202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18636972507136 + 1565138613025 = 4317056^2 + 1251055^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202111120161 - 2² = 20202111120157 is a prime.

It is a super-2 number, since 2×20202111120161² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20202111120461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101055560080 + 10101055560081.

It is an arithmetic number, because the mean of its divisors is an integer number (10101055560081).

Almost surely, 2^{20202111120161} is an apocalyptic number.

It is an amenable number.

20202111120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202111120161 is an equidigital number, since it uses as much as digits as its factorization.

20202111120161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 20202111120161 its reverse (16102111120202), we get a palindrome (36304222240363).

The spelling of 20202111120161 in words is "twenty trillion, two hundred two billion, one hundred eleven million, one hundred twenty thousand, one hundred sixty-one".