33841721 has 2 divisors, whose sum is σ = 33841722. Its totient is φ = 33841720.

The previous prime is 33841699. The next prime is 33841723. The reversal of 33841721 is 12714833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 5112121 = 5360^2 + 2261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33841721 is a prime.

It is a super-2 number, since 2×33841721² = 2290524160483682, which contains 22 as substring.

Together with 33841723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (33841723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16920860 + 16920861.

It is an arithmetic number, because the mean of its divisors is an integer number (16920861).

Almost surely, 2^33841721 is an apocalyptic number.

It is an amenable number.

33841721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33841721 is an equidigital number, since it uses as much as digits as its factorization.

33841721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 33841721 is about 5817.3637500160. The cubic root of 33841721 is about 323.4576896745.

The spelling of 33841721 in words is "thirty-three million, eight hundred forty-one thousand, seven hundred twenty-one".