21076439 has 8 divisors (see below), whose sum is σ = 21455280. Its totient is φ = 20700736.

The previous prime is 21076427. The next prime is 21076463. The reversal of 21076439 is 93467012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21076439 - 2⁴ = 21076423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21076499) 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 in 7 ways as a sum of consecutive naturals, for example, 15707 + ... + 16995.

It is an arithmetic number, because the mean of its divisors is an integer number (2681910).

Almost surely, 2^21076439 is an apocalyptic number.

21076439 is a deficient number, since it is larger than the sum of its proper divisors (378841).

21076439 is a wasteful number, since it uses less digits than its factorization.

21076439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21076439 is about 4590.9082979297. The cubic root of 21076439 is about 276.2267573929.

The spelling of 21076439 in words is "twenty-one million, seventy-six thousand, four hundred thirty-nine".