21105834 has 16 divisors (see below), whose sum is σ = 42927840. Its totient is φ = 6915920.

The previous prime is 21105811. The next prime is 21105863. The reversal of 21105834 is 43850112.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29457 + ... + 30164.

It is an arithmetic number, because the mean of its divisors is an integer number (2682990).

Almost surely, 2^21105834 is an apocalyptic number.

21105834 is an abundant number, since it is smaller than the sum of its proper divisors (21822006).

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

21105834 is a wasteful number, since it uses less digits than its factorization.

21105834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59685.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21105834 is about 4594.1086186550. The cubic root of 21105834 is about 276.3551142064.

Adding to 21105834 its reverse (43850112), we get a palindrome (64955946).

The spelling of 21105834 in words is "twenty-one million, one hundred five thousand, eight hundred thirty-four".