21275686 has 8 divisors (see below), whose sum is σ = 31940784. Its totient is φ = 10628760.

The previous prime is 21275677. The next prime is 21275693. The reversal of 21275686 is 68657212.

It is a happy number.

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

It is a congruent number.

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, 1090 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (3992598).

Almost surely, 2^21275686 is an apocalyptic number.

21275686 is a deficient number, since it is larger than the sum of its proper divisors (10665098).

21275686 is a wasteful number, since it uses less digits than its factorization.

21275686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9086.

The product of its digits is 40320, while the sum is 37.

The square root of 21275686 is about 4612.5574251168. The cubic root of 21275686 is about 277.0944692053.

The spelling of 21275686 in words is "twenty-one million, two hundred seventy-five thousand, six hundred eighty-six".