21255682 has 8 divisors (see below), whose sum is σ = 36438336. Its totient is φ = 9109572.

The previous prime is 21255679. The next prime is 21255721. The reversal of 21255682 is 28655212.

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, 759118 + ... + 759145.

It is an arithmetic number, because the mean of its divisors is an integer number (4554792).

Almost surely, 2^21255682 is an apocalyptic number.

21255682 is a deficient number, since it is larger than the sum of its proper divisors (15182654).

21255682 is a wasteful number, since it uses less digits than its factorization.

21255682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518272.

The product of its digits is 9600, while the sum is 31.

The square root of 21255682 is about 4610.3884868848. The cubic root of 21255682 is about 277.0075979618.

The spelling of 21255682 in words is "twenty-one million, two hundred fifty-five thousand, six hundred eighty-two".