21085082 has 8 divisors (see below), whose sum is σ = 31657716. Its totient is φ = 10532512.

The previous prime is 21085061. The next prime is 21085087. The reversal of 21085082 is 28058012.

It can be written as a sum of positive squares in 2 ways, for example, as 18054001 + 3031081 = 4249^2 + 1741^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21085087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033 + ... + 6804.

Almost surely, 2^21085082 is an apocalyptic number.

21085082 is a deficient number, since it is larger than the sum of its proper divisors (10572634).

21085082 is a wasteful number, since it uses less digits than its factorization.

21085082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10032.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 21085082 is about 4591.8495184403. The cubic root of 21085082 is about 276.2645104749.

The spelling of 21085082 in words is "twenty-one million, eighty-five thousand, eighty-two".