21068433 has 6 divisors (see below), whose sum is σ = 30432194. Its totient is φ = 14045616.

The previous prime is 21068417. The next prime is 21068441. The reversal of 21068433 is 33486012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17040384 + 4028049 = 4128^2 + 2007^2 .

It is not a de Polignac number, because 21068433 - 2⁴ = 21068417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21068397 and 21068406.

It is not an unprimeable number, because it can be changed into a prime (21068233) 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 in 5 ways as a sum of consecutive naturals, for example, 1170460 + ... + 1170477.

Almost surely, 2^21068433 is an apocalyptic number.

It is an amenable number.

21068433 is a deficient number, since it is larger than the sum of its proper divisors (9363761).

21068433 is a wasteful number, since it uses less digits than its factorization.

21068433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340943 (or 2340940 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21068433 is about 4590.0362743665. The cubic root of 21068433 is about 276.1917775513.

The spelling of 21068433 in words is "twenty-one million, sixty-eight thousand, four hundred thirty-three".