21675386 has 8 divisors (see below), whose sum is σ = 33561984. Its totient is φ = 10488060.

The previous prime is 21675359. The next prime is 21675419. The reversal of 21675386 is 68357612.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174740 + ... + 174863.

It is an arithmetic number, because the mean of its divisors is an integer number (4195248).

Almost surely, 2^21675386 is an apocalyptic number.

21675386 is a deficient number, since it is larger than the sum of its proper divisors (11886598).

21675386 is a wasteful number, since it uses less digits than its factorization.

21675386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349636.

The product of its digits is 60480, while the sum is 38.

The square root of 21675386 is about 4655.6831936892. The cubic root of 21675386 is about 278.8189453219.

The spelling of 21675386 in words is "twenty-one million, six hundred seventy-five thousand, three hundred eighty-six".