33921661 has 2 divisors, whose sum is σ = 33921662. Its totient is φ = 33921660.

The previous prime is 33921649. The next prime is 33921683. The reversal of 33921661 is 16612933.

33921661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22992025 + 10929636 = 4795^2 + 3306^2 .

It is an emirp because it is prime and its reverse (16612933) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33921661 - 2⁹ = 33921149 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 (33921691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16960830 + 16960831.

It is an arithmetic number, because the mean of its divisors is an integer number (16960831).

Almost surely, 2^33921661 is an apocalyptic number.

It is an amenable number.

33921661 is a deficient number, since it is larger than the sum of its proper divisors (1).

33921661 is an equidigital number, since it uses as much as digits as its factorization.

33921661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 33921661 is about 5824.2305071142. The cubic root of 33921661 is about 323.7121770734.

The spelling of 33921661 in words is "thirty-three million, nine hundred twenty-one thousand, six hundred sixty-one".