21794329 has 4 divisors (see below), whose sum is σ = 22325940. Its totient is φ = 21262720.

The previous prime is 21794299. The next prime is 21794347. The reversal of 21794329 is 92349712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5513104 + 16281225 = 2348^2 + 4035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21794329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21794359) 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 3 ways as a sum of consecutive naturals, for example, 265744 + ... + 265825.

It is an arithmetic number, because the mean of its divisors is an integer number (5581485).

Almost surely, 2^21794329 is an apocalyptic number.

It is an amenable number.

21794329 is a deficient number, since it is larger than the sum of its proper divisors (531611).

21794329 is an equidigital number, since it uses as much as digits as its factorization.

21794329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531610.

The product of its digits is 27216, while the sum is 37.

The square root of 21794329 is about 4668.4396750949. The cubic root of 21794329 is about 279.3280186818.

The spelling of 21794329 in words is "twenty-one million, seven hundred ninety-four thousand, three hundred twenty-nine".