21141110161 has 2 divisors, whose sum is σ = 21141110162. Its totient is φ = 21141110160.

The previous prime is 21141110117. The next prime is 21141110167. The reversal of 21141110161 is 16101114112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19077134400 + 2063975761 = 138120^2 + 45431^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141110161 - 2¹¹ = 21141108113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21141110167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570555080 + 10570555081.

It is an arithmetic number, because the mean of its divisors is an integer number (10570555081).

Almost surely, 2^21141110161 is an apocalyptic number.

It is an amenable number.

21141110161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141110161 is an equidigital number, since it uses as much as digits as its factorization.

21141110161 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 19.

Adding to 21141110161 its reverse (16101114112), we get a palindrome (37242224273).

The spelling of 21141110161 in words is "twenty-one billion, one hundred forty-one million, one hundred ten thousand, one hundred sixty-one".