21580853 has 8 divisors (see below), whose sum is σ = 24883008. Its totient is φ = 18333504.

The previous prime is 21580841. The next prime is 21580859. The reversal of 21580853 is 35808512.

It is a happy number.

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

It is not a de Polignac number, because 21580853 - 2⁸ = 21580597 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 (21580859) 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 7 ways as a sum of consecutive naturals, for example, 12851 + ... + 14432.

It is an arithmetic number, because the mean of its divisors is an integer number (3110376).

Almost surely, 2^21580853 is an apocalyptic number.

It is an amenable number.

21580853 is a deficient number, since it is larger than the sum of its proper divisors (3302155).

21580853 is a wasteful number, since it uses less digits than its factorization.

21580853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27403.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 21580853 is about 4645.5196695311. The cubic root of 21580853 is about 278.4130163369.

The spelling of 21580853 in words is "twenty-one million, five hundred eighty thousand, eight hundred fifty-three".