21602668 has 12 divisors (see below), whose sum is σ = 37908640. Its totient is φ = 10771632.

The previous prime is 21602663. The next prime is 21602687. The reversal of 21602668 is 86620612.

It is not an unprimeable number, because it can be changed into a prime (21602663) 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, 5748 + ... + 8731.

Almost surely, 2^21602668 is an apocalyptic number.

It is an amenable number.

21602668 is a deficient number, since it is larger than the sum of its proper divisors (16305972).

21602668 is a wasteful number, since it uses less digits than its factorization.

21602668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14856 (or 14854 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21602668 is about 4647.8670376851. The cubic root of 21602668 is about 278.5067959882.

The spelling of 21602668 in words is "twenty-one million, six hundred two thousand, six hundred sixty-eight".