21332333161 has 2 divisors, whose sum is σ = 21332333162. Its totient is φ = 21332333160.

The previous prime is 21332333131. The next prime is 21332333189. The reversal of 21332333161 is 16133323312.

It is an a-pointer prime, because the next prime (21332333189) can be obtained adding 21332333161 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20215436761 + 1116896400 = 142181^2 + 33420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21332333161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21332333101) 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, 10666166580 + 10666166581.

It is an arithmetic number, because the mean of its divisors is an integer number (10666166581).

Almost surely, 2^21332333161 is an apocalyptic number.

It is an amenable number.

21332333161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332333161 is an equidigital number, since it uses as much as digits as its factorization.

21332333161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 28.

Adding to 21332333161 its reverse (16133323312), we get a palindrome (37465656473).

The spelling of 21332333161 in words is "twenty-one billion, three hundred thirty-two million, three hundred thirty-three thousand, one hundred sixty-one".