161033021 has 2 divisors, whose sum is σ = 161033022. Its totient is φ = 161033020.

The previous prime is 161033017. The next prime is 161033063. The reversal of 161033021 is 120330161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158508100 + 2524921 = 12590^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 161033021 - 2² = 161033017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161033011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80516510 + 80516511.

It is an arithmetic number, because the mean of its divisors is an integer number (80516511).

Almost surely, 2^161033021 is an apocalyptic number.

It is an amenable number.

161033021 is a deficient number, since it is larger than the sum of its proper divisors (1).

161033021 is an equidigital number, since it uses as much as digits as its factorization.

161033021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 161033021 is about 12689.8786834233. The cubic root of 161033021 is about 544.0493721860.

Adding to 161033021 its reverse (120330161), we get a palindrome (281363182).

The spelling of 161033021 in words is "one hundred sixty-one million, thirty-three thousand, twenty-one".