21718108 has 6 divisors (see below), whose sum is σ = 38006696. Its totient is φ = 10859052.

The previous prime is 21718087. The next prime is 21718133. The reversal of 21718108 is 80181712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2714760 + ... + 2714767.

Almost surely, 2^21718108 is an apocalyptic number.

It is an amenable number.

21718108 is a deficient number, since it is larger than the sum of its proper divisors (16288588).

21718108 is a wasteful number, since it uses less digits than its factorization.

21718108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5429531 (or 5429529 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 21718108 is about 4660.2690909431. The cubic root of 21718108 is about 279.0020083530.

The spelling of 21718108 in words is "twenty-one million, seven hundred eighteen thousand, one hundred eight".