21058385 has 8 divisors (see below), whose sum is σ = 25304640. Its totient is φ = 16823664.

The previous prime is 21058369. The next prime is 21058417. The reversal of 21058385 is 58385012.

It is a happy number.

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 21058385 - 2⁴ = 21058369 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1844 + ... + 6746.

It is an arithmetic number, because the mean of its divisors is an integer number (3163080).

Almost surely, 2^21058385 is an apocalyptic number.

It is an amenable number.

21058385 is a deficient number, since it is larger than the sum of its proper divisors (4246255).

21058385 is an equidigital number, since it uses as much as digits as its factorization.

21058385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5767.

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

The square root of 21058385 is about 4588.9415991054. The cubic root of 21058385 is about 276.1478632542.

The spelling of 21058385 in words is "twenty-one million, fifty-eight thousand, three hundred eighty-five".