33706721 has 2 divisors, whose sum is σ = 33706722. Its totient is φ = 33706720.

The previous prime is 33706697. The next prime is 33706727. The reversal of 33706721 is 12760733.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33223696 + 483025 = 5764^2 + 695^2 .

It is an emirp because it is prime and its reverse (12760733) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33706721 - 2¹⁴ = 33690337 is a prime.

It is a super-2 number, since 2×33706721² = 2272286081143682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (33706727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16853360 + 16853361.

It is an arithmetic number, because the mean of its divisors is an integer number (16853361).

Almost surely, 2^33706721 is an apocalyptic number.

It is an amenable number.

33706721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33706721 is an equidigital number, since it uses as much as digits as its factorization.

33706721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 33706721 is about 5805.7489611591. The cubic root of 33706721 is about 323.0270084481.

The spelling of 33706721 in words is "thirty-three million, seven hundred six thousand, seven hundred twenty-one".