21682468 has 12 divisors (see below), whose sum is σ = 39594240. Its totient is φ = 10369832.

The previous prime is 21682433. The next prime is 21682487. The reversal of 21682468 is 86428612.

It is an unprimeable number.

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, 117748 + ... + 117931.

It is an arithmetic number, because the mean of its divisors is an integer number (3299520).

Almost surely, 2^21682468 is an apocalyptic number.

It is an amenable number.

21682468 is a deficient number, since it is larger than the sum of its proper divisors (17911772).

21682468 is a wasteful number, since it uses less digits than its factorization.

21682468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235706 (or 235704 counting only the distinct ones).

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

The square root of 21682468 is about 4656.4437073801. The cubic root of 21682468 is about 278.8493081915.

The spelling of 21682468 in words is "twenty-one million, six hundred eighty-two thousand, four hundred sixty-eight".