21108134 has 4 divisors (see below), whose sum is σ = 31662204. Its totient is φ = 10554066.

The previous prime is 21108133. The next prime is 21108137. The reversal of 21108134 is 43180112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21108133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277032 + ... + 5277035.

It is an arithmetic number, because the mean of its divisors is an integer number (7915551).

Almost surely, 2^21108134 is an apocalyptic number.

21108134 is a deficient number, since it is larger than the sum of its proper divisors (10554070).

21108134 is a wasteful number, since it uses less digits than its factorization.

21108134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10554069.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21108134 is about 4594.3589324301. The cubic root of 21108134 is about 276.3651524053.

Adding to 21108134 its reverse (43180112), we get a palindrome (64288246).

The spelling of 21108134 in words is "twenty-one million, one hundred eight thousand, one hundred thirty-four".