33161321 has 2 divisors, whose sum is σ = 33161322. Its totient is φ = 33161320.

The previous prime is 33161309. The next prime is 33161329. The reversal of 33161321 is 12316133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32035600 + 1125721 = 5660^2 + 1061^2 .

It is an emirp because it is prime and its reverse (12316133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33161321 - 2⁶ = 33161257 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 33161293 and 33161302.

It is not a weakly prime, because it can be changed into another prime (33161329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16580660 + 16580661.

It is an arithmetic number, because the mean of its divisors is an integer number (16580661).

Almost surely, 2^33161321 is an apocalyptic number.

It is an amenable number.

33161321 is a deficient number, since it is larger than the sum of its proper divisors (1).

33161321 is an equidigital number, since it uses as much as digits as its factorization.

33161321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 20.

The square root of 33161321 is about 5758.5867189789. The cubic root of 33161321 is about 321.2752529518.

Adding to 33161321 its reverse (12316133), we get a palindrome (45477454).

It can be divided in two parts, 3316132 and 1, that added together give a palindrome (3316133).

The spelling of 33161321 in words is "thirty-three million, one hundred sixty-one thousand, three hundred twenty-one".