33121122161 has 2 divisors, whose sum is σ = 33121122162. Its totient is φ = 33121122160.

The previous prime is 33121122143. The next prime is 33121122241. The reversal of 33121122161 is 16122112133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33085791025 + 35331136 = 181895^2 + 5944^2 .

It is an emirp because it is prime and its reverse (16122112133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33121122161 is a prime.

It is not a weakly prime, because it can be changed into another prime (33121122121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16560561080 + 16560561081.

It is an arithmetic number, because the mean of its divisors is an integer number (16560561081).

Almost surely, 2^33121122161 is an apocalyptic number.

It is an amenable number.

33121122161 is a deficient number, since it is larger than the sum of its proper divisors (1).

33121122161 is an equidigital number, since it uses as much as digits as its factorization.

33121122161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

Adding to 33121122161 its reverse (16122112133), we get a palindrome (49243234294).

The spelling of 33121122161 in words is "thirty-three billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred sixty-one".