21706108 has 6 divisors (see below), whose sum is σ = 37985696. Its totient is φ = 10853052.

The previous prime is 21706103. The next prime is 21706109. The reversal of 21706108 is 80160712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2713260 + ... + 2713267.

Almost surely, 2^21706108 is an apocalyptic number.

It is an amenable number.

21706108 is a deficient number, since it is larger than the sum of its proper divisors (16279588).

21706108 is a wasteful number, since it uses less digits than its factorization.

21706108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426531 (or 5426529 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 21706108 is about 4658.9814337471. The cubic root of 21706108 is about 278.9506128244.

The spelling of 21706108 in words is "twenty-one million, seven hundred six thousand, one hundred eight".