21086582 has 8 divisors (see below), whose sum is σ = 34505352. Its totient is φ = 9584800.

The previous prime is 21086581. The next prime is 21086609. The reversal of 21086582 is 28568012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479219 + ... + 479262.

It is an arithmetic number, because the mean of its divisors is an integer number (4313169).

Almost surely, 2^21086582 is an apocalyptic number.

21086582 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21086582 is a deficient number, since it is larger than the sum of its proper divisors (13418770).

21086582 is a wasteful number, since it uses less digits than its factorization.

21086582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958494.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 21086582 is about 4592.0128484141. The cubic root of 21086582 is about 276.2710615038.

The spelling of 21086582 in words is "twenty-one million, eighty-six thousand, five hundred eighty-two".