33500921 has 2 divisors, whose sum is σ = 33500922. Its totient is φ = 33500920.

The previous prime is 33500917. The next prime is 33500927. The reversal of 33500921 is 12900533.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20976400 + 12524521 = 4580^2 + 3539^2 .

It is a cyclic number.

It is not a de Polignac number, because 33500921 - 2² = 33500917 is a prime.

It is a super-2 number, since 2×33500921² = 2244623415696482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (33500927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16750460 + 16750461.

It is an arithmetic number, because the mean of its divisors is an integer number (16750461).

Almost surely, 2^33500921 is an apocalyptic number.

It is an amenable number.

33500921 is a deficient number, since it is larger than the sum of its proper divisors (1).

33500921 is an equidigital number, since it uses as much as digits as its factorization.

33500921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 33500921 is about 5787.9980131303. The cubic root of 33500921 is about 322.3682405495.

Adding to 33500921 its sum of digits (23), we get a square (33500944 = 5788²).

The spelling of 33500921 in words is "thirty-three million, five hundred thousand, nine hundred twenty-one".