21916108 has 6 divisors (see below), whose sum is σ = 38353196. Its totient is φ = 10958052.

The previous prime is 21916093. The next prime is 21916109. The reversal of 21916108 is 80161912.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21916109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2739510 + ... + 2739517.

Almost surely, 2^21916108 is an apocalyptic number.

It is an amenable number.

21916108 is a deficient number, since it is larger than the sum of its proper divisors (16437088).

21916108 is a wasteful number, since it uses less digits than its factorization.

21916108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5479031 (or 5479029 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 21916108 is about 4681.4643008358. The cubic root of 21916108 is about 279.8473147143.

The spelling of 21916108 in words is "twenty-one million, nine hundred sixteen thousand, one hundred eight".