21768682 has 8 divisors (see below), whose sum is σ = 35164836. Its totient is φ = 10047072.

The previous prime is 21768679. The next prime is 21768709. The reversal of 21768682 is 28686712.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 1437601 = 4509^2 + 1199^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418603 + ... + 418654.

Almost surely, 2^21768682 is an apocalyptic number.

21768682 is a deficient number, since it is larger than the sum of its proper divisors (13396154).

21768682 is a wasteful number, since it uses less digits than its factorization.

21768682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837272.

The product of its digits is 64512, while the sum is 40.

The square root of 21768682 is about 4665.6920172682. The cubic root of 21768682 is about 279.2184070234.

The spelling of 21768682 in words is "twenty-one million, seven hundred sixty-eight thousand, six hundred eighty-two".