21682486 has 16 divisors (see below), whose sum is σ = 37290240. Its totient is φ = 9262440.

The previous prime is 21682433. The next prime is 21682487. The reversal of 21682486 is 68428612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21682487) 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 7 ways as a sum of consecutive naturals, for example, 2295 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (2330640).

Almost surely, 2^21682486 is an apocalyptic number.

21682486 is a deficient number, since it is larger than the sum of its proper divisors (15607754).

21682486 is a wasteful number, since it uses less digits than its factorization.

21682486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019.

The product of its digits is 36864, while the sum is 37.

The square root of 21682486 is about 4656.4456401852. The cubic root of 21682486 is about 278.8493853550.

The spelling of 21682486 in words is "twenty-one million, six hundred eighty-two thousand, four hundred eighty-six".