33868921 has 2 divisors, whose sum is σ = 33868922. Its totient is φ = 33868920.

The previous prime is 33868909. The next prime is 33868931. The reversal of 33868921 is 12986833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21344400 + 12524521 = 4620^2 + 3539^2 .

It is an emirp because it is prime and its reverse (12986833) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33868921 - 2⁵ = 33868889 is a prime.

It is a super-2 number, since 2×33868921² = 2294207619408482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33868931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16934460 + 16934461.

It is an arithmetic number, because the mean of its divisors is an integer number (16934461).

Almost surely, 2^33868921 is an apocalyptic number.

It is an amenable number.

33868921 is a deficient number, since it is larger than the sum of its proper divisors (1).

33868921 is an equidigital number, since it uses as much as digits as its factorization.

33868921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 33868921 is about 5819.7011091636. The cubic root of 33868921 is about 323.5443252714.

The spelling of 33868921 in words is "thirty-three million, eight hundred sixty-eight thousand, nine hundred twenty-one".