21680582 has 32 divisors (see below), whose sum is σ = 42315264. Its totient is φ = 8078400.

The previous prime is 21680497. The next prime is 21680587. The reversal of 21680582 is 28508612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21680587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482 + ... + 6602.

It is an arithmetic number, because the mean of its divisors is an integer number (1322352).

Almost surely, 2^21680582 is an apocalyptic number.

21680582 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21680582 is a deficient number, since it is larger than the sum of its proper divisors (20634682).

21680582 is a wasteful number, since it uses less digits than its factorization.

21680582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6164.

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

The square root of 21680582 is about 4656.2411879111. The cubic root of 21680582 is about 278.8412229335.

The spelling of 21680582 in words is "twenty-one million, six hundred eighty thousand, five hundred eighty-two".