33416821 has 2 divisors, whose sum is σ = 33416822. Its totient is φ = 33416820.

The previous prime is 33416813. The next prime is 33416857. The reversal of 33416821 is 12861433.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21958596 + 11458225 = 4686^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 33416821 - 2³ = 33416813 is a prime.

It is a super-2 number, since 2×33416821² = 2233367851492082, which contains 22 as substring.

It is equal to p_2055790 and since 33416821 and 2055790 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33416821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33416321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16708410 + 16708411.

It is an arithmetic number, because the mean of its divisors is an integer number (16708411).

Almost surely, 2^33416821 is an apocalyptic number.

It is an amenable number.

33416821 is a deficient number, since it is larger than the sum of its proper divisors (1).

33416821 is an equidigital number, since it uses as much as digits as its factorization.

33416821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 33416821 is about 5780.7284143090. The cubic root of 33416821 is about 322.0982590450.

The spelling of 33416821 in words is "thirty-three million, four hundred sixteen thousand, eight hundred twenty-one".