21102222110161 has 2 divisors, whose sum is σ = 21102222110162. Its totient is φ = 21102222110160.

The previous prime is 21102222110077. The next prime is 21102222110209. The reversal of 21102222110161 is 16101122220112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21030882371136 + 71339739025 = 4585944^2 + 267095^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102222110161 - 2¹¹ = 21102222108113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102222110561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551111055080 + 10551111055081.

It is an arithmetic number, because the mean of its divisors is an integer number (10551111055081).

Almost surely, 2^{21102222110161} is an apocalyptic number.

It is an amenable number.

21102222110161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102222110161 is an equidigital number, since it uses as much as digits as its factorization.

21102222110161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 21102222110161 its reverse (16101122220112), we get a palindrome (37203344330273).

The spelling of 21102222110161 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-two million, one hundred ten thousand, one hundred sixty-one".