21698168 has 16 divisors (see below), whose sum is σ = 41258160. Its totient is φ = 10696000.

The previous prime is 21698167. The next prime is 21698191. The reversal of 21698168 is 86189612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21698167) 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, 18533 + ... + 19668.

It is an arithmetic number, because the mean of its divisors is an integer number (2578635).

Almost surely, 2^21698168 is an apocalyptic number.

It is an amenable number.

21698168 is a deficient number, since it is larger than the sum of its proper divisors (19559992).

21698168 is a wasteful number, since it uses less digits than its factorization.

21698168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38278 (or 38274 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 21698168 is about 4658.1292382243. The cubic root of 21698168 is about 278.9165957022.

The spelling of 21698168 in words is "twenty-one million, six hundred ninety-eight thousand, one hundred sixty-eight".