21065333 has 2 divisors, whose sum is σ = 21065334. Its totient is φ = 21065332.

The previous prime is 21065287. The next prime is 21065351. The reversal of 21065333 is 33356012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15194404 + 5870929 = 3898^2 + 2423^2 .

It is a cyclic number.

It is not a de Polignac number, because 21065333 - 2¹² = 21061237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21065299 and 21065308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27065333) 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, 10532666 + 10532667.

It is an arithmetic number, because the mean of its divisors is an integer number (10532667).

Almost surely, 2^21065333 is an apocalyptic number.

It is an amenable number.

21065333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21065333 is an equidigital number, since it uses as much as digits as its factorization.

21065333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 21065333 is about 4589.6985739806. The cubic root of 21065333 is about 276.1782306411.

The spelling of 21065333 in words is "twenty-one million, sixty-five thousand, three hundred thirty-three".