21634108 has 12 divisors (see below), whose sum is σ = 37909872. Its totient is φ = 10802720.

The previous prime is 21634091. The next prime is 21634111. The reversal of 21634108 is 80143612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (3159156).

Almost surely, 2^21634108 is an apocalyptic number.

It is an amenable number.

21634108 is a deficient number, since it is larger than the sum of its proper divisors (16275764).

21634108 is a wasteful number, since it uses less digits than its factorization.

21634108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7172 (or 7170 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21634108 is about 4651.2480045682. The cubic root of 21634108 is about 278.6418411783.

The spelling of 21634108 in words is "twenty-one million, six hundred thirty-four thousand, one hundred eight".