21189834 has 24 divisors (see below), whose sum is σ = 45996132. Its totient is φ = 7050240.

The previous prime is 21189827. The next prime is 21189899. The reversal of 21189834 is 43898112.

It can be written as a sum of positive squares in 2 ways, for example, as 20385225 + 804609 = 4515^2 + 897^2 .

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 17802 + ... + 18954.

Almost surely, 2^21189834 is an apocalyptic number.

21189834 is an abundant number, since it is smaller than the sum of its proper divisors (24806298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21189834 is a wasteful number, since it uses less digits than its factorization.

21189834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182 (or 2179 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 21189834 is about 4603.2416838571. The cubic root of 21189834 is about 276.7212546922.

The spelling of 21189834 in words is "twenty-one million, one hundred eighty-nine thousand, eight hundred thirty-four".