21776108 has 12 divisors (see below), whose sum is σ = 38197320. Its totient is φ = 10862592.

The previous prime is 21776081. The next prime is 21776123. The reversal of 21776108 is 80167712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4373 + ... + 7916.

It is an arithmetic number, because the mean of its divisors is an integer number (3183110).

Almost surely, 2^21776108 is an apocalyptic number.

It is an amenable number.

21776108 is a deficient number, since it is larger than the sum of its proper divisors (16421212).

21776108 is a wasteful number, since it uses less digits than its factorization.

21776108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12736 (or 12734 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 21776108 is about 4666.4877584753. The cubic root of 21776108 is about 279.2501535505.

The spelling of 21776108 in words is "twenty-one million, seven hundred seventy-six thousand, one hundred eight".