21695768 has 16 divisors (see below), whose sum is σ = 40760280. Its totient is φ = 10826368.

The previous prime is 21695767. The next prime is 21695783. The reversal of 21695768 is 86759612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21695761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2096 + ... + 6912.

Almost surely, 2^21695768 is an apocalyptic number.

It is an amenable number.

21695768 is a deficient number, since it is larger than the sum of its proper divisors (19064512).

21695768 is a wasteful number, since it uses less digits than its factorization.

21695768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5386 (or 5382 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 21695768 is about 4657.8716169512. The cubic root of 21695768 is about 278.9063118154.

The spelling of 21695768 in words is "twenty-one million, six hundred ninety-five thousand, seven hundred sixty-eight".